Hi Roezmv!
No worries at all. I'm a bit confused that you say the error was fixed in v21.2, as that's the version I'm using. I just double-checked and it still has the error. It's interesting - it only crops up when other players given access to the sheet try to roll dice. I can roll them fine, but if I share a 'can edit' link with a player and they use that to access, they get the roll error.
Thank you for sending the app script editor edit. I can make use of that if there's no easy fix.
Best wishes,
Adam