Hi! So happy to have found this awesome plugin. Yet, I've a similar problem.

As an admin I opened a thread in one of the forums and I got an error too. Then the title of the thread shows up but when clicking nothing appears, I can't even erase it.

I checked everything you mentioned, but the problem persists.  Just in case, this is the forum and the "Sinuhe, el egipcio" can't be erased.
https://campus.educoencasa.com/foro/literatura-historica/
Thanks a lot