so I entered a world and set a fire on a tree and then set the tick speed to a very big number the fire did not spread then I turned the tick speed a very big negative number nothing happened then I noticed a problem when the wolfs on my screen was not moving I found a horse I dug a hole below the horse and the horse did not fall down then I thought it was a bug so I saved the world and I waited 1 minute it was still saving world so I pressed the x to close minecraft but nothing happened it took like 7 minute for it to close
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Duplicate of MC-76117, which was later resolved as, "Works As Intended".

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This is not relevant to the bugs section.
The game has been overloaded (guess from your tick speed issue, and the frozen entities), which has caused it to have slow saving.