I updated a world last opened in 1.20.4 to 1.21 in the method of Optimize World with Erase Cached Data on. After joining the world and placing a Trail Spawner, insert a Zombie Villager Spawn Egg, the Trail Spawn still not works as expected.
What's needed to be pointed out that this issue may affects not only one world. The world attachment below can be used to reproduce the issue.
This video may help out:
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Cannot reproduce. When optimizing a 1.20.4 world with Erase Cached Data enabled, and upgrading it to 1.21, the Trial Spawner spawns Zombie Villagers as expected.
@Jarl-Penguin
Perhaps no; the main affected world's size (.zip format) is over 120MB and I've no idea how to upload it.
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