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Check for Anonymous user is not correct, here is a patch to fix it.

rmasoad@gmail.com → created an issue.

Line 97 in ContentEntityCloneFormBase indicates that entity reference fields to content entities can be clonable as well!
Commenting out 'entity_reference' will make it work!

This is a working patch for the latest dev version 8.x-1.x commit 8fc509ec701ce8e8a7834127040663518a6b326c