"Configure system" UI broken, clicking "Apply" does nothing

Jenkins 2.277.2 Plugins: Show Build Parameters plugin (show-build-parameters): 1.0 Xcode integration (xcode-plugin): 2.0.14 JavaScript GUI Lib: jQuery bundles (jQuery and jQuery UI) plugin (jquery-detached): 1.2.1 Gradle Plugin (gradle): 1.36 Multiple SCMs plugin (multiple-scms): 0.6 Authorize Project (authorize-project): 1.3.0 Folders Plugin (cloudbees-folder): 6.14 Persistent Parameter Plugin (persistent-parameter): 1.2 Bitbucket Server Integration (atlassian-bitbucket-server-integration): 2.1.0 Workspace Cleanup Plugin (ws-cleanup): 0.38 Durable Task Plugin (durable-task): 1.34 Plain Credentials Plugin (plain-credentials): 1.7 Pipeline: Stage View Plugin (pipeline-stage-view): 2.13 Common API for Blue Ocean (blueocean-commons): 1.24.3 EC2 Fleet Jenkins Plugin (ec2-fleet): 2.1.1 Rebuilder (rebuild): 1.31 Pipeline implementation for Blue Ocean (blueocean-pipeline-api-impl): 1.24.3 Extended Choice Parameter Plug-In (extended-choice-parameter): 0.82 DTKit 2 API. (dtkit-api): 2.1.2 Build Notifications Plugin (build-notifications): 1.5.0 Cobertura Plugin (cobertura): 1.16 Node and Label parameter plugin (nodelabelparameter): 1.7.2 HTML Publisher plugin (htmlpublisher): 1.23 Embeddable Build Status Plugin (embeddable-build-status): 2.0.3 Job Configuration History Plugin (jobConfigHistory): 2.26 Handy Uri Templates 2.x API Plugin (handy-uri-templates-2-api): 2.1.8-1.0 Pipeline Utility Steps (pipeline-utility-steps): 2.6.1 GitHub plugin (github): 1.33.1 Docker Slaves Plugin (docker-slaves): 1.0.7 SonarQube Scanner for Jenkins (sonar): 2.11 Bitbucket Server Notifier (stashNotifier): 1.20 Ant Plugin (ant): 1.11 bouncycastle API Plugin (bouncycastle-api): 2.18 NodeJS Plugin (nodejs): 1.3.7 Maven Integration plugin (maven-plugin): 3.7 Dashboard for Blue Ocean (blueocean-dashboard): 1.23.2 Pipeline: Job (workflow-job): 2.39 Config File Provider Plugin (config-file-provider): 3.6.3 i18n for Blue Ocean (blueocean-i18n): 1.23.2 Job DSL (job-dsl): 1.77 Pipeline: Model API (pipeline-model-api): 1.7.1 Pipeline: Step API (workflow-step-api): 2.23 Timestamper (timestamper): 1.11.5 Bitbucket Pipeline for Blue Ocean (blueocean-bitbucket-pipeline): 1.24.3 Publish Over SSH (publish-over-ssh): 1.20.1 MapDB API Plugin (mapdb-api): 1.0.9.0 Code Coverage API Plugin (code-coverage-api): 1.1.6 Pipeline (workflow-aggregator): 2.6 LDAP Plugin (ldap): 1.26 JIRA Integration for Blue Ocean (blueocean-jira): 1.23.2 Amazon S3 Bucket Credentials Plugin (aws-bucket-credentials): 1.0.0 Pipeline: Declarative Agent API (pipeline-model-declarative-agent): 1.1.1 Docker Commons Plugin (docker-commons): 1.17 Authentication Tokens API Plugin (authentication-tokens): 1.4 GitHub Pipeline for Blue Ocean (blueocean-github-pipeline): 1.23.2 File Operations Plugin (file-operations): 1.11 Configuration as Code Plugin (configuration-as-code): 1.47 Pipeline: Declarative Extension Points API (pipeline-model-extensions): 1.7.1 Display URL for Blue Ocean (blueocean-display-url): 2.3.1 OkHttp Plugin (okhttp-api): 3.14.9 Pipeline: Stage Tags Metadata (pipeline-stage-tags-metadata): 1.7.1 Plugin Utilities API Plugin (plugin-util-api): 1.2.2 Config API for Blue Ocean (blueocean-config): 1.23.2 Build Monitor View (build-monitor-plugin): 1.12+build.201809061734 ECharts API Plugin (echarts-api): 4.8.0-2 Pipeline: Multibranch (workflow-multibranch): 2.22 Windows Exe Runner Plugin (windows-exe-runner): 1.2 Throttle Concurrent Builds Plug-in (throttle-concurrents): 2.0.2 Bitbucket Branch Source Plugin (cloudbees-bitbucket-branch-source): 2.9.8 Amazon Web Services SDK (aws-java-sdk): 1.11.821 REST API for Blue Ocean (blueocean-rest): 1.24.3 Apache HttpComponents Client 4.x API Plugin (apache-httpcomponents-client-4-api): 4.5.13-1.0 Copy Artifact Plugin (copyartifact): 1.45.1 SSH Credentials Plugin (ssh-credentials): 1.18.1 Matrix Project Plugin (matrix-project): 1.18 Global Slack Notifier Plugin (global-slack-notifier): 1.5 SSH Build Agents plugin (ssh-slaves): 1.31.2 Remote Jenkinsfile Provider (remote-file): 1.13 Extensible Choice Parameter plugin (extensible-choice-parameter): 1.7.0 Web for Blue Ocean (blueocean-web): 1.24.3 Run Condition Plugin (run-condition): 1.3 PowerShell plugin (powershell): 1.4 Variant Plugin (variant): 1.3 Blue Ocean Pipeline Editor (blueocean-pipeline-editor): 1.23.2 Lockable Resources plugin (lockable-resources): 2.8 Pipeline: Supporting APIs (workflow-support): 3.8 Branch API Plugin (branch-api): 2.5.8 Display URL API (display-url-api): 2.3.4 Conditional BuildStep (conditional-buildstep): 1.3.6 Amazon ECR plugin (amazon-ecr): 1.6 EnvInject API Plugin (envinject-api): 1.7 PAM Authentication plugin (pam-auth): 1.6 JavaScript GUI Lib: Moment.js bundle plugin (momentjs): 1.1.1 Bitbucket Plugin (bitbucket): 1.1.27 Personalization for Blue Ocean (blueocean-personalization): 1.23.2 JavaScript GUI Lib: ACE Editor bundle plugin (ace-editor): 1.1 SAML Plugin (saml): 1.1.6 jQuery plugin (jquery): 1.12.4-1 Pipeline: Multibranch build strategy extension (multibranch-build-strategy-extension): 1.0.10 Pipeline: Nodes and Processes (workflow-durable-task-step): 2.35 Pipeline: Shared Groovy Libraries (workflow-cps-global-lib): 2.17 Infrastructure plugin for Publish Over X (publish-over): 0.22 Subversion Plug-in (subversion): 2.13.1 MSBuild Plugin (msbuild): 1.29 Pipeline: Stage Step (pipeline-stage-step): 2.5 Extended Read Permission Plugin (extended-read-permission): 3.2 Allure Jenkins Plugin (allure-jenkins-plugin): 2.28.1 Favorite (favorite): 2.3.2 Token Macro Plugin (token-macro): 2.15 Docker Pipeline (docker-workflow): 1.23 Dashboard View (dashboard-view): 2.12 JWT for Blue Ocean (blueocean-jwt): 1.24.3 External Monitor Job Type Plugin (external-monitor-job): 1.7 Git client plugin (git-client): 3.7.1 Events API for Blue Ocean (blueocean-events): 1.23.2 GIT server Plugin (git-server): 1.9 xUnit plugin (xunit): 2.3.9 Bitbucket Build Status Notifier Plugin (bitbucket-build-status-notifier): 1.4.2 Ivy Plugin (ivy): 2.1 REST Implementation for Blue Ocean (blueocean-rest-impl): 1.24.3 JSch dependency plugin (jsch): 0.1.55.2 Build Failure Analyzer (build-failure-analyzer): 1.27.1 Multibranch Scan Webhook Trigger (multibranch-scan-webhook-trigger): 1.0.5 HTTP Request Plugin (http_request): 1.8.26 Pipeline SCM API for Blue Ocean (blueocean-pipeline-scm-api): 1.24.3 Javadoc Plugin (javadoc): 1.6 Structs Plugin (structs): 1.22 Artifactory Plugin (artifactory): 3.9.0 Pipeline: REST API Plugin (pipeline-rest-api): 2.13 Autofavorite for Blue Ocean (blueocean-autofavorite): 1.2.4 Git plugin (git): 4.7.1 Matrix Authorization Strategy Plugin (matrix-auth): 2.6.5 Node Iterator API Plugin (node-iterator-api): 1.5.0 Build Timeout (build-timeout): 1.20 Mercurial plugin (mercurial): 2.10 JavaScript GUI Lib: Handlebars bundle plugin (handlebars): 1.1.1 OWASP Markup Formatter Plugin (antisamy-markup-formatter): 2.1 Convert To Pipeline (convert-to-pipeline): 1.0 Oracle Java SE Development Kit Installer Plugin (jdk-tool): 1.4 Pipeline: SCM Step (workflow-scm-step): 2.12 Content Replace (content-replace): 1.5.1 Pipeline: Milestone Step (pipeline-milestone-step): 1.3.1 GitHub Branch Source Plugin (github-branch-source): 2.10.2 Snakeyaml API Plugin (snakeyaml-api): 1.27.0 Pipeline: Build Step (pipeline-build-step): 2.12 Pipeline: Input Step (pipeline-input-step): 2.11 Trilead API Plugin (trilead-api): 1.0.13 Role-based Authorization Strategy (role-strategy): 3.0 Git Parameter Plug-In (git-parameter): 0.9.12 Basic Branch Build Strategies Plugin (basic-branch-build-strategies): 1.3.2 Pipeline: API (workflow-api): 2.40 Jackson 2 API Plugin (jackson2-api): 2.12.3 Test Results Analyzer Plugin (test-results-analyzer): 0.3.5 Terraform Plugin (terraform): 1.0.10 Email Extension Template Plugin (emailext-template): 1.1 Build Name and Description Setter (build-name-setter): 2.1.0 Git Pipeline for Blue Ocean (blueocean-git-pipeline): 1.23.2 Build Environment Plugin (build-environment): 1.7 SCM Sync Configuration Plugin (scm-sync-configuration): 0.0.10 Amazon EC2 Container Service plugin with autoscaling capabilities (scalable-amazon-ecs): 1.0 Extra Columns Plugin (extra-columns): 1.22 Active Choices Plug-in (uno-choice): 2.5.1 GitHub API Plugin (github-api): 1.123 SSH Agent Plugin (ssh-agent): 1.20 Server Sent Events (SSE) Gateway Plugin (sse-gateway): 1.23 AnsiColor (ansicolor): 0.7.2 Script Security Plugin (script-security): 1.76 JQuery3 API Plugin (jquery3-api): 3.5.1-1 Design Language (jenkins-design-language): 1.24.3 Mailer Plugin (mailer): 1.32.1 Pipeline: GitHub Groovy Libraries (pipeline-github-lib): 1.0 Amazon EC2 plugin (ec2): 1.51 SCM API Plugin (scm-api): 2.6.4 Pipeline: Declarative (pipeline-model-definition): 1.7.1 JUnit Plugin (junit): 1.30 Text Finder (text-finder): 1.15 Email Extension Plugin (email-ext): 2.80 CloudBees AWS Credentials Plugin (aws-credentials): 1.28 HashiCorp Vault Plugin (hashicorp-vault-plugin): 3.6.0 S3 publisher plugin (s3): 0.11.5 Monitor Pro Plugin (monitor-pro): 1.0.9 Jira plugin (jira): 3.1.1 Pipeline Graph Analysis Plugin (pipeline-graph-analysis): 1.10 Java JSON Web Token (JJWT) Plugin (jjwt-api): 0.11.2-9.c8b45b8bb173 Pipeline: Basic Steps (workflow-basic-steps): 2.20 Environment Injector Plugin (envinject): 2.3.0 WMI Windows Agents Plugin (windows-slaves): 1.6 Pub-Sub "light" Bus (pubsub-light): 1.13 Credentials Binding Plugin (credentials-binding): 1.23 Resource Disposer Plugin (resource-disposer): 0.14 Slack Notification Plugin (slack): 2.40 Pipeline NPM Integration Plugin (pipeline-npm): 0.9.2 Blue Ocean (blueocean): 1.23.2 Command Agent Launcher Plugin (command-launcher): 1.4 Active Directory plugin (active-directory): 2.16 SSH plugin (ssh): 2.6.1 Parameterized Trigger plugin (parameterized-trigger): 2.40 Credentials Plugin (credentials): 2.3.18 Amazon Elastic Container Service (ECS) / Fargate plugin (amazon-ecs): 1.36 Pipeline: Groovy (workflow-cps): 2.82 Progress Bar Column Plugin (progress-bar-column-plugin): 1.0 Blue Ocean Core JS (blueocean-core-js): 1.24.3 NUnit plugin (nunit): 0.27 Pipeline: AWS Steps (pipeline-aws): 1.42