Connecting logistics pipes(mekanism) with crafty crate have the problem of loss.
I have created a packer of coal blocks coming out of the box to which are connected logistics pipes. If the box gets more than 1 coal it all the coal from this slot is placed in one slot crafty crate. Next, if fill the crafty crate then leaves only 1 coal block, the rest of the coal simply disappears
The problem is solved installing slow pipes (bildkraft) or chute in front of the crafty crate

sounds like a mekanism bug (not checking stack limit)

if i'm break crafty crate before fill them, i get all coal back