Yep, just stumbled over this as well.
Since I'm running off an old save file I edited way back in 2018 (I just recently started playing again) I thought that might be the problem, so I even took another look at the save file with the current editor, just to note that I can't find any Thrud related flags (at least not searching for "thrud" )
And here my character was, after two consecutive cloisterings, with his blue balled nuki nuts ready to put that load to good use, only for the scene to misfire