The only time it happened to me was when i opened my bags up late one day and the next day when i got my new bags it didn’t give me any gypsum because the cooldown(20-24hr??) had not reset yet. So open your bags as soon as you get them.
There seems to be a cooldown on getting the 3 gypsums, so if you miss one or two in a day then it gets messed up. just save up the bags and open 3 per day
I always wait to open them until I have all 3, and then open them immediately. So I’m not sure what the issue is that’s causing the loot roll to fail, but I’m not hoarding them.