QSU are losing content when you broke multiple QSU at the same time on FTB Unstable.
it seems to affect the QSU that whas not focused.

version of Unstable : 1.0.6
version of the mod : 4.3.5

reproductible : yes.
on server : nope, local gameplay, untested on server

demo (traitment by YT actually, should be ready rapidely. xD) : https://www.youtube.com/watch?v=Hr1ayfY8ru0

fixed in new build

thanks for your quick reaction and quick fix.