Put the summary of the bug you're having here
What I expected to happen was I cut off the pumpkin head before the snow puppet died:
What actually happened was...:
Snow puppet has been twitching, pumpkin head will not fall, when I re-enter, all around the white, snow puppet is still twitching, piglin and Warthog beast is the same, when I return to the main world, there is no problem in the main world, there is still a problem in hell.
But I can't send my archive because it's over 10MB
This is translated by translation software, so mistakes are inevitable.
As soon as I go in, it's just like the picture. I can't continue to play
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Thank you for your report!
We're tracking this issue in MC-227996, so this ticket is being resolved and linked as a duplicate.
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I'm going to assume that you started experiencing this problem when you travel to the Nether ("hell") (chunks not loading, mobs twitching),
and that it returns to normal when you return to the Overworld ("main world").
If that is correct, then this is a duplicate of MC-228220,
caused (in my testing) by mods, specifically OptiFine.