I just dumped 20 charcoal in the firepit to heat a stack of flint, the temperature only got to 860 degrees and yielded no calcined flint chunks. I don't know if this is a change in 1.22 or what. I was frustrated with the flint cooking process in the previous version, so I installed the Better Firepit mod. I thought that this mod would be causing an issue, I disabled it, but same thing. If someone could let me know if there is a new mechanic or I am doing something wrong that would be great.