Hey, i have a question.

I play my minecraft server world in Forge 1.12.2, and i would like to change to forge 1.16.5, but i have used the chisel mod. When i change de version, i have put the mod in the correct version (1.16.5) but when i play the game, the marble block and all the block that i chisel disappear but the mod run. I would like to know how to use the chisel mod in version 1.16.5 but the marble and chiseled blocks of version 1.12.2 do not disappear.

Thank you

I've experienced that before and all I tell is that the blocks are replaced with air

This is unfortunately just how it is. The flattening meant we had to change almost all of our block IDs, and there's not a good way to remap metadata values to separate blocks.