Found that colonists don't seem to deposit debris onto a junk stockpile that has blood on it, instead they place it down to the side even if that side isn't designated as a stockpile.
Could anybody else test this? I've had it happen a few times now but just want to be sure.
Edit - Just tried cleaning up the blood in the stockpile and instructed a colonist to haul another piece of debris to the same spot, it worked as normal.
Thanks for reporting.
Already known and reported.