When you put Fish in Packim (like Dogfish) he eats it and leaves behind Spoiled Fish. The problems is if you give him a stack of Fish he will leave behind only one single Spoiled FIsh, despite there being more than 1 Fish in the stack.
Steps to Reproduce
Give Packim a stack of 20 Dogfish. Count the Spoiled Fish that is left behind.
This issue has been fixed in either a future version or updated in a previous version.