What exact version of Tomcat is being used? We also saw this with Tomcat 9.0.93 and a Grails 4 application.

In our research we found a couple of potential changelog entries that were relevant:

1. Correct regressions in the refactoring that added recycling of the coyote request and response to the HTTP/2 processing. (markt)
2. Update: The system property org.apache.catalina.connector.RECYCLE_FACADES will now default to true if not specified, which will in turn set the default value for the discardFacades connector attribute, thus causing facade objects to be discarded by default. (remm)

https://tomcat.apache.org/tomcat-9.0-doc/changelog.html

The RECYCLE_FACADES system property might be able to mitigate this but I haven't tested it. We used Tomcat 9.0.86 and moved on for now.