I saw that there is a similar issue #1124 which was solved but I get this error even with that patch in v1.3.2 java.lang.UnsupportedOperationException: class ...

Recently upgrade from mockk = "1.14.0" to mockk = "1.14.4" and got this exception: I'm rollback to previous version and works fine. Rolling back didn't resolve it for me - it was present in 1.13.x ...