Chunks do not load and it is not possible to fly.
At that time it does not allow to close the game correctly because it only says "saving world". It happens with worlds updated from 1.12.2, please improve the performance as in 1.12.2.
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Thank you for your report!
However, this issue has been temporarily closed as Awaiting Response.
Please attach (or provide a download link of) the world here so we can reproduce the issue (preferably from 1.12.2).
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Try upgrading your world by erasing the cached data.