This is super odd. This comment wasn't here earlier, and it pinged in my inbox hours after Anonymous Badger's post. Either I'm blind or something went odd.
Thank you though for helping to figure this out!
My post got held for moderation because it was my first one on the forum, and I included a link. And no problem.
FYI, For people on Linux single player, you can fix up the quest data in existing worlds this way:
1. Open a terminal and navigate to your save directory.
2. Run the following commands:
cp QuestDatabase.json QuestDatabase.json.backup
sed -i.backup2 -Ee 's/\xef\xbf\xbd/\xc2\xa7/g' QuestDatabase.json
If anyone's having this problem on MacOS, I
think you can do the same thing, except the second line should be:
sed -i .backup2 -Ee 's/\xef\xbf\xbd/\xc2\xa7/g' QuestDatabase.json
Note the one space difference.
Please be aware that I haven't tested this one!
I'd imagine you can do the same in multiplayer, but I don't know where the file that you need to edit is offhand.
Also, if you do the "quest tablet firmware update" quest, it'll undo the fix.