I've just merged https://github.com/treeverse/lakeFS/pull/4933. It tests GC with Hadoop 2 on the Spark host. previously we were testing only Hadoop 2 assemblies in a modern Spark build, which is not the same.
This test currently fails - TDD FTW! So it is marked so as not to fail the build. You should see it red but will still be allowed to merge without force.
Thanks, and sorry for any confusion.