The Heavy Core originally had a 100% drop rate from the first Breeze in a chamber. People just killed one Breeze and reset worlds.
"In Beta 1.21.0.21, the Breeze wasn't just annoying—it was a predator. Its wind charges would launch you 50 blocks straight up. No slow falling. Just you, the skybox, and a very painful re-entry. Players started carrying water buckets just to survive a single hit." minecraft 1.21 beta
"Mojang saw this and said 'nah, too fun.' #minecraft121 #minecraftbeta" The Heavy Core originally had a 100% drop