Soooo, that’s the other thing to watch out for.
Once you get to too many parts, the GFUI panics and won’t let you separate the clones from the originals – it groups things. So for those cases, I save out a new cutsheet, and destroy the off-screen bits so that all that remains is the grid of parts. Deleting the original paths instantly de-clones them, so it might take a minute or two when you do it while inkscape reconsiders its life choices.
This was the case when I posted that recent 400+ part de-masking.
This is a cloned sheet, but I had to make a copy of the file and unclone them. Just too many paths for the poor gfui.
Of course I kept the cloned sheet, because that’s the point, but when cutting you may have to undo your cool clone array to get it done.