Friendly (and some hostile) mobs don't drop anything

So I was playing a server with my friends and after we updated to 20w46a, we noticed, that friendly mobs (such as Squids, Cows and Pigs) don't seem to drop anything, even if we kill them a million times. This also affects some hostile mobs like Creepers, Blazes, Hoglins and Phantoms. I ran the command /gamerule doMobDrops (or something) to true and they STILL don't seem to drop anything. I hope this issue will by resolved by 20w48a and if not, then my friends will most likely stop playing the server, because we just can't progress through the game normally. This issue should be HIGH priority