Test case available in here [1]

When a transaction commits, the write skew check performs the validation by casting the cache entry to a ClusteredRepeatableReadEntry. However, the entry is a DeltaAwareCacheEntry.

This happens when you have operations over a map inside a transaction.

The tests failing are:
WriteSkewFineGrainedAtomicMapAPITest.testSizeOnCache()
WriteSkewFineGrainedAtomicMapAPITest.testCreateMapInTx()

[1]https://github.com/pruivo/infinispan/commits/t_atomic_map_issue