What happened?

I'm not sure if it is an issue or it is intended, but there are some random patches of overworld blocks in some Nether places

BetterNether

7.0.2

BCLib

2.0.5

Fabric API

0.56.0

Fabric Loader

0.14.8

Minecraft

1.19

Relevant log output

None

Other Mods

better-end-2.0.2
iris-mc1.19-1.2.5
sodium-fabric-mc1.19-0.4.2+build.16

Those are actually intended.