I've been slowly working on making a Quest Line for my modpack as of late, which is in 1.12.2 and I just found out that I can't delete any Quest Rewards after making them

Mod Ver: 5.4.0
MC Ver: 1.12.2
Forge: 14.23.5.2860

Recreate;

1. Make a Quest
2. Make a Reward
3. Try to delete it
4. Fail miserably

I know the mod hasn't been updated since mid 2019 for 1.12.2, but I'd greatly appreciate this pain in the rear of a bug to be fixed
Also, it doesn't say anywhere that 1.12.2 is Depreciated, so if you truly won't fix it, atleast put that at the top of the CurseForge Page
Thanks! :D