QuidemTest and DiffRepository have incremental build issues. The reason is that they write output to build/resources/test.
The test tasks treat build/resources/test as an input, so if there are changes made to the directory the test tasks are considered no longer UP-TO-DATE.
Currently QuidemTest and DiffRepository, which are used by tests, write to this directory. DiffRepository writes test results to be compared with expected results. QuidemTest creates some sql files which are used during testing. This causes issues with incremental build support for the test tasks. I'm attaching screenshots from a build scan to show this.
Neither of these need to be written to the build/resources/test directory, they can be put somewhere else in the build directory and therefore not cause issues with incremental build support.