Gristmill and sawmill stop detecting toolhead
when logging out in singleplayer and later logging back in, the toolheads in gristmill and sawmill are no longer detected. you then have to take them out of machine and put them back in, then the machine work as intended.
singleplayer. have a working windmill with either gristmill or sawmill. have the correct toolhead in machine and log out out to main menu or fully out of game. log back in to the saved game and put materials in machine to be processed. it then don't start.
removing toolhead and placing it back in machine should restart it.