When trying to duplicate a content I am getting the following message JSON Parse error 'unrecognized' token '<', I already looked at log and also some netword items and I can not identify the problem I thought in the upgrade to Moodle 3.3.2+ this would be solved.

But even when the message is displayed the item is duplicated, just press the F5 key.

More details = php version 7.1.6