i cannot reproduce this, so you are either using a modded client or something else…
Can confirm this. Having random stuff in the game is fine for some things but not things like this. It makes a lot of stuff especially on a technical level very unpredictable and unreliable and no one likes to deal with randomness when working on a project. This doesn’t affect just iron farms but a lot of other stuff as well. Ur now basically rolling dice whenever u try to do anything with the mobs that have this.
This is a YOU issue as ive just tested this on a vanilla client and they def drop magma cream. So its either a mod issue or datapack issue or a server issue.
WAI?? Not to be mean but how does that make sense? It's literally blocks made of ice and they just suddenly should not be slippery like normal ice? Like what…