Local transaction not removed from transaction table with keySet, entrySet, values operations

The cleanup phase of FilesystemQueryDslIterationTest of this test is based on Cache.clear() and is very slow , taking about 30 seconds, or at least that's how much we gain if the cache cleanup is removed. Without the cleanup, this test takes about 2.5 seconds, so we need to investigate why Cache.clear() creates a problem here or in general.