Chunks with lot of redstone are removed when converting a world from 1.11 or older to 20w18a
[02:46:44] [Server thread/ERROR]: Couldn't load chunk [18, 94]
java.lang.NullPointerException: null
[02:46:45] [Server thread/ERROR]: Couldn't load chunk [17, 94]
java.lang.NullPointerException: null
[02:46:46] [Server thread/ERROR]: Couldn't load chunk [17, 95]
java.lang.NullPointerException: null
[02:46:46] [Server thread/ERROR]: Couldn't load chunk [18, 95]
java.lang.NullPointerException: nullNote: No stacktraces are logged, possibly because the wrong logging methods are called (last parameter is Object and not Throwable)? The class logging this is called yf in 20w18a (Mojang name: net.minecraft.server.level.ChunkMap).
Edit:
The world is fast brewing station from ilmango
https://www.mediafire.com/file/d6xjnzuxk2cchld/fast_brewing_system.zip/file
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violine1101
Could you provide a test world for this?
violine1101
Might be the same issue as MC-181522?
marcono1234
It is probably not just redstone, I was able to convert a world with redstone dust in various shapes just fine from 1.13.2 to 20w18a.
Additionaly it appears the world has been edited with MCEdit (contains file mcedit_waypoints.dat), so it could be that MCEdit corrupted / removed data and Minecraft has been lenient enough to still handle that in the past.
Do you have a world which has not been edited with third party programs?
boq