I am not sure that this is a problem in single player but on 3rd party servers in the latest snapshots (20w17a+) Maps are broken. They have patterns of grey and black patches through them and it is hard to recognize anything on them. Also since 20w17a there has been a problem with rain. Rain goes through random blocks and on some blocks during a storm there will not be rain. This can be bad during a thunderstorm where if lightning strikes a primarily wooden build it could very easily get burnt down with no rain to extinguish the fire. These seem to be the only bugs I have found and again they only seem to be happening on 3rd party servers.
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Ah okay thank you. I will tell him
Hello there!
The server owner needs to optimise the world. This bug was fixed in 20w18a, however it requires the world to be optimised to patch it.
I did this myself by copying the world folder and putting it in my singleplayer worlds folder, and then optimised it, and then put it back on the server.
^Sharpy.