The zap plugin has a known issue that it cannot save configuration forms with Jenkins 2.277.1 and later. The plugin has not been updated for configuration form modernization.
The zap plugin also has a known security vulnerability as reported in https://jenkins.io/security/advisory/2019-04-03/#SECURITY-1041
The zap plugin was last released 6 years ago. It needs a new maintainer to adopt it, modernize it, fix the security issue, and release a new version. If the plugin is important to your company, you should propose to your company that you want to adopt the plugin, modernize it, fix the security vulnerability, and release a new version.
Jenkins version: 2.375.3 & 2.342
ZAP version: 1.1.0