Bug description
Can't change the dimension name, because the value of the dimension_names key is always considered invalid and the default value is used

Log files
Configuration file /home/gekkone/.minecraft/config/gravestone-client.toml is not correct. Correcting
[net.minecraftforge.common.ForgeConfigSpec/CORE]: Incorrect key dimension_names was corrected from [minecraft:overworld=Overworld, minecraft:nether=Nether, minecraft:the_end=The End] to [minecraft:overworld=Overworld, minecraft:nether=Nether, minecraft:the_end=The End]

Versions

• 1.16.1
• 32.0.108
• 1.0.6

This was fixed with #2
Consider updating to 1.16.2

The forge API doesn't allow you to migrate this fix to 1.16.1?

No. I don't have time to maintain every minecraft version. I usually support the latest two or three major versions.
And like forge I am not focusing on minor versions.