Only have the 1st 3 tiers of furnaces even though the ultimate belts space age mod is in use.

Ill check

for me they show up

Then I may have a mod conflicting. Will start disabling some and see what I find. Thanks

No luck, I posted details of what I tried on github. I also included a fresh game save with minimal mods and all research done. Also 2 screen shots. Maybe you can take a look and see what's going on when you get time. Game just updated yesterday, no idea if that affected it or not since that is same day I installed your mod.

Ok so the problem is quite simple I did not understand.

Ultimate belts space age is not supported, only space age vanilla, Ill add support for that mod in the next release.

Ok, thank you !