Tests via Maven not run correctly

When executing tests via the parent-pom mvn test all is working well.

When executing tests of only schematicMorph-pom via mvn -f schematicMorph test the error TestEngine with ID 'junit-jupiter' failed to discover tests occurs, even though its a subset of tests.

When executing tests of isochroneDataObjects (which has a similar child-pom) via mvn -f isochronedataobjects test the tests are found and run as expected. Why?