Sometimes when you write in the text editor the text completely disappears.

Which version of Better Questing are you using? are there any errors in the console logs?

Just confirming I've been able to recreate it and it's not unique to the editor either it seems. I have found the issue and fixed it in dev but I'm not sure if I can put a fixed build right now. The database code is a bit of a hot mess at the moment due to it being in mid rewrite. I'll see what I can do about tidying up the work-in-progress code to make an interim build

Well, I'll revert back to 3.5.250 when there was no problem until a fix is out

Minecraft 1.12.2
Forge 14.23.3.2668
Better Questing 3.5.256

The log was spammed with this
[18:56:25] [main/ERROR] [betterquesting]: Line count mismatch (24 != 23) while drawing formatted text!

Quests File: https://pastebin.com/tkEB0pm1
Quest at line 8232