Create or go to a vanilla 1.21.10 world. Move a mob into the nether. Mobs can no longer go back through the same portal.
Mobs expected to go back through the portal after like 15 seconds.
Mobs can never go back through that portal.
Attempted ways of fixing the issue: Relighting the portal, building a portal right next to it, rejoining (singleplayer) world, “Optimizing” world to latest version.
I already tried to go onto the wiki and reddit but no one knows how to fix this and the bug began for me on 1.21.9 but there were no changes related to this in the wikihttps://minecraft.wiki/w/Java_Edition_1.21.9
Environment
vanilla, 1.21.9-1.21.10, normal settings.
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