I tried it again without mods, still the same issue (I totally forgot to disable them in the first term, savegame can be loaded without any but the base mod)

I wondered why my seemingly full belt only outputs 7. After running a 'debugger' with a 'breakpoint' I saw that there was, indeed, a gap on the belt, and after building a test setup, I could reproduce the issue frequently. A stack inserter picking up from a left turned belt causes a transport belt g...