On the event edit screen, I saw there was a Console message from the compat3 plugin, whatever that is. So please deactivate that one alone and re-test the line break issue.
If it’s not the solution, please continue disabling the rest, per our Testing for Conflicts Guide.
Hey there! This thread has been pretty quiet for the last three weeks, so we’re going to go ahead and close it to avoid confusion with other topics. If you’re still looking for help with this, please do open a new thread, reference this one and we’d be more than happy to continue the conversation over there.