Using @Persistable leads to WARN "Failed to logout persistableSession"

Using @Persistable in a REST resource, and probably also in an HST Component, as described at https://xmdocumentation.bloomreach.com/library/concepts/component-development/hstcomponent-persistable-annotation-and-workflow.html leads to

WARN  http-nio-8080-exec-7 [PersistableAnnotationInvokerPostprocessor.postprocoess:62] Failed to logout persistableSession
java.lang.IllegalStateException: Invalid session which is already returned to the pool! 
at org.hippoecm.hst.core.jcr.pool.PooledSessionDecoratorProxyFactoryImpl$PooledSessionInterceptor.intercept(PooledSessionDecoratorProxyFactoryImpl.java:106) ~[hst-session-pool-14.7.4.jar:?]
...
at com.sun.proxy.$Proxy221.logout(Unknown Source) ~[?:?]
at org.hippoecm.hst.jaxrs.cxf.PersistableAnnotationInvokerPostprocessor.postprocoess(PersistableAnnotationInvokerPostprocessor.java:60) [hst-jaxrs-14.7.8.jar:14.7.8]

Reproduction
See myproject14.7.8-persistable.zip

• 14.7.8 project, add Simple Content and manual REST resource
• in ContentDocumentResource, add 

      @POST
      @Path("/doPost")
      @Persistable
      public void doPost(@Context final HttpServletRequest request,
                                           @Context HttpServletResponse servletResponse) {
  
          System.out.println("HIT org.example.rest.ContentDocumentResource.doPost");
      }
  

• do a POST at http://localhost:8080/site/api-manual/ContentDocument/doPost

Result: WARN "Failed to logout persistableSession" with stack trace

Analysis

This is a result of CMS-14930 (14.7.4, 15.0.0)

• PersistableAnnotationInvokerPostprocessor#postprocoess (sic!) calls both requestContext.setSession and persistableSession.logout()
• the change in CMS-14930 already does a log out by calling disposeResource in HstRequestContextImpl#setSession