This test has been an Image Failure on Catalina
This test is failing on Catalina sense we brought up testers. This test is marked as pass on Mojave+ so this seems to be a real problem.
The test is failing with a bad gradient by the looks of it.
This test was unmarked in expectations in https://trac.webkit.org/changeset/251474/webkit
This did not seem to make the test pass on High Sierra or Catalina when looking at history
I updated expectations so this test is only marked as passing in Mojave: https://trac.webkit.org/changeset/253589/webkit