Yep, I checked my inventory each time to make sure I was actually holding some. 238 during one attempt, 246 (the max my char could hold) during another. Got the same message whether I had any or not.
The other bug reports are from about a year ago.
https://github.com/CleverRaven/Cataclysm-DDA/issues/40771
https://discourse.cataclysmdda.org/t/rock-forge-does-not-consume-charcoal/24007
https://github.com/CleverRaven/Cataclysm-DDA/issues/40848
The last one is a duplicate, same bug as one of the others reported by a different person. One of them also mentions the same issue cropping up about 4 years before.