pymediawikidocker tries run a MediaWiki environment with different version of MediaWiki and is not prepared yet to handle different versions of extensions.
The CI of the tests shows the following error:
The content of stderr is 'Fatal error: Uncaught ExtensionDependencyError: PageForms is not compatible with the current MediaWiki core (version 1.31.14), it requires: >= 1.32.0.
Which PageForms version is incompatible? I had to go to the extension webpage to guess that this is for version 5.3.1 - Unfortunately this seems not to be semantic versioning compatible with composer. I selected ^5.2.1 and was wondering why i still get the error message. I am now forced to pin to 5.2.1 for the time being.