[MC-187594] Custom Dimension Loading is Now Broken No Matter The Settings

The error message that occurs every time I try to create/load a world with a custom dimension is:

---- Minecraft Crash Report ----
// This doesn't make any sense!


Time: 6/5/20, 6:35 AM
Description: Exception in server tick loop


java.lang.IllegalStateException: Unregistered dimension type: cic@702a2c6e
	at net.minecraft.server.MinecraftServer.a(SourceFile:407)
	at java.base/java.util.Optional.orElseThrow(Optional.java:408)
	at net.minecraft.server.MinecraftServer.a(SourceFile:407)
	at net.minecraft.server.MinecraftServer.l_(SourceFile:334)
	at eov.d(SourceFile:69)
	at net.minecraft.server.MinecraftServer.v(SourceFile:646)
	at net.minecraft.server.MinecraftServer.a(SourceFile:256)
	at java.base/java.lang.Thread.run(Thread.java:834)

The files test1.txt and test2.txt were used to test world creation after loading 1.16 pre1. worldgen_settings_export.json is the file I used to create my Redstone Testing world. I had to manually remove the dimension using an nbt editor in order to be able to get back into that world. I also had to remove the extra dimension's nbt for my survival world too.

The survival world had a caves dimension generation which I used to simulate a cave update for the time being.