Parts of villages are regenerating after unloading and reloading the chunk. I had edited one of the animal pens with a tree in it and after leaving and coming back, half of it had reverted back to its original state. Same thing happened on another world but with flowing water reappearing without its source block.
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We're tracking this issue in MC-241204, so this ticket is being resolved and linked as a duplicate.
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This new snapshot is having problems with villages. If you're walking around (exploring) and a new village is generated, your game will crash.