Tim Jacomb I found it in a proprietary test.
While trying to reproduce it in the acceptance-test-harness repository, I've found that it is not related to MavenModuleSet jobs, but to the Parameters of type "Password" in all the jobs.
Also, the breaking change is not related to tables-to-divs, but to the 2.236 release.
The path to the Password parameter default value changed with https://github.com/jenkinsci/jenkins/pull/4630/files#diff-bb80f35e7698754c0c72d989e4f04406.
The default defaultValue path is no longer valid. Now it has to be defaultValueAsSecret. I'm creating a PR to provide a PO for PasswordParameter with this change, and a small test to validate it