When trying to place a quality Loader with More Quality Scaling installed, it causes a non-recoverable error:

The mod Loaders make full stacks (1.1.2) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event loaders-make-full-stacks::on_built_entity (ID 6)
__loaders-make-full-stacks__/control.lua:80: attempt to index global 'new_entity' (a nil value)
stack traceback:
    __loaders-make-full-stacks__/control.lua:80: in function 'replace'
    __loaders-make-full-stacks__/control.lua:160: in function <__loaders-make-full-stacks__/control.lua:155>

It seems like the same issue also occurs with your other mod: Lane Filtered Loaders
Stacking Loaders works just fine though.