I've come across some trouble. Furnaces around the area we are currently in don't smelt unless you tab into the furnace itself and watch them smelt. No matter of block closeness makes them actively smelt and the animation on them [the fire] never pops up.
- In the picture is a bundle of ACTIVELY smelting furnaces checked after about 5 minutes of smelting.
- If needed I can post the coordinates but I'd like to hold off for privacy, just let me know if it's needed though
More information:
I left myself AFK with one of these furnaces open and it + the surrounding furnaces successfully smelted a large chunk of cobble I put in.
