Saw the other report but my problem is different.

When I copy a chest, but then change my mind and want to copy another one the mod wont let me. I'll need to paste the copied contents somewhere successfully and only then can I copy another chest. Same thing happens if the destination chest doesn't have enough room for all of the contents when pasting.

Using the copy-chest keybind with nothing (or anything but a chest I think) will clear out the saved data.
Still related to the other report. Still thinking up better ways to handle it.