Minecraft 1.21.1
MiniHUD 0.32.51 and 0.32.52

debugChunkBorder shows no Border. Version 0.32.50 works for me

Copying the response from Sakura-Ryoko on Discord also here:

There is a debug renderer main toggle
it turns on the Debug Data Service in single player.
Main reason is to help mange expectations of them all working or not with the extra Vanilla packets