now I have my own reproducer too

https://github.com/argustelecom/hibernate-bugreproducer-11202

this is simple infinispan dual-node test which puts and gets entity instance with embeddable component PK

P.S. in 5.0.7 problem can be catched only after some patching (to use DefaultCacheKeysFactory).
P.S.2 for me problem resolved by modifying ClassicalCacheKeyImplementation so as to not use type.isEqual code from #equals