It appears that there's some incompatibility between those two plugins in their current latest versions. If both are installed and enabled, Jenkins startup fails with the following error message. Is this something that you can help with?

Error

io.jenkins.plugins.casc.ConfiguratorException: 'checkWorkspaceOnSlave' is deprecated

        at io.jenkins.plugins.casc.BaseConfigurator.configure(BaseConfigurator.java:330)

        at io.jenkins.plugins.casc.BaseConfigurator.check(BaseConfigurator.java:293)

        at io.jenkins.plugins.casc.BaseConfigurator.configure(BaseConfigurator.java:360)

        at io.jenkins.plugins.casc.BaseConfigurator.check(BaseConfigurator.java:293)

        at io.jenkins.plugins.casc.ConfigurationAsCode.lambda$checkWith$9(ConfigurationAsCode.java:797)

        at io.jenkins.plugins.casc.ConfigurationAsCode.invokeWith(ConfigurationAsCode.java:731)

Caused: io.jenkins.plugins.casc.ConfiguratorException: unclassified: error configuring 'unclassified' with class io.jenkins.plugins.casc.impl.configurators.GlobalConfigurationCategoryConfigurator configurator

        at io.jenkins.plugins.casc.ConfigurationAsCode.invokeWith(ConfigurationAsCode.java:737)

        at io.jenkins.plugins.casc.ConfigurationAsCode.checkWith(ConfigurationAsCode.java:797)

        at io.jenkins.plugins.casc.ConfigurationAsCode.configureWith(ConfigurationAsCode.java:783)

        at io.jenkins.plugins.casc.ConfigurationAsCode.configureWith(ConfigurationAsCode.java:652)

        at io.jenkins.plugins.casc.ConfigurationAsCode.configure(ConfigurationAsCode.java:314)

        at io.jenkins.plugins.casc.ConfigurationAsCode.init(ConfigurationAsCode.java:306)

Caused: java.lang.reflect.InvocationTargetException

        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

        at java.base/java.lang.reflect.Method.invoke(Method.java:566)

        at hudson.init.TaskMethodFinder.invoke(TaskMethodFinder.java:109)

Caused: java.lang.Error

        at hudson.init.TaskMethodFinder.invoke(TaskMethodFinder.java:115)

        at hudson.init.TaskMethodFinder$TaskImpl.run(TaskMethodFinder.java:185)

        at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:305)

        at jenkins.model.Jenkins$5.runTask(Jenkins.java:1164)

        at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:221)

        at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:120)

        at jenkins.security.ImpersonatingExecutorService$1.run(ImpersonatingExecutorService.java:68)

        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)

        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)

        at java.base/java.lang.Thread.run(Thread.java:829)

Caused: org.jvnet.hudson.reactor.ReactorException

        at org.jvnet.hudson.reactor.Reactor.execute(Reactor.java:290)

        at jenkins.InitReactorRunner.run(InitReactorRunner.java:49)

        at jenkins.model.Jenkins.executeReactor(Jenkins.java:1199)

        at jenkins.model.Jenkins.<init>(Jenkins.java:987)

        at hudson.model.Hudson.<init>(Hudson.java:86)

        at hudson.model.Hudson.<init>(Hudson.java:82)

        at hudson.WebAppMain$3.run(WebAppMain.java:247)

Caused: hudson.util.HudsonFailedToLoad

        at hudson.WebAppMain$3.run(WebAppMain.java:264)