Elytron SubsystemTransformerTestCase has some methods prepared to test the transformation against 7.4.0, however, those methods are using 7.3.0 as the target controller version.

My guess is those methods were created before we had WF23 as the temporal EAP 7.4.0.

Once we have WFCORE-5347 resolved, these methods could use the new 7.4.0 controller version.