Could you implement a config feature or include it in the copy activity, that if a prefab named "item_drop.prefab" is found, it's ignored and not included in the copy action?  When they accidentally get included, we get errors like... 

Invalid Position: item_drop[2355353] (-1117.21, -500.53, 628.87) (destroying)
Invalid Position: item_drop[2355354] (-1116.72, -500.89, 631.14) (destroying)
Invalid Position: item_drop[2355357] (-1113.65, -501.13, 632.93) (destroying)
Invalid Position: item_drop[2355352] (-1114.56, -500.49, 630.86) (destroying)
Invalid Position: item_drop[2355355] (-1113.47, -500.76, 631.05) (destroying)
Invalid Position: item_drop[2355356] (-1113.56, -501.29, 633.64) (destroying)


If anyone wants to fix existing CopyPaste files, search the copy paste file for anything with a prefab name "item_drop" and remove it.  Will get rid of those errors.  Alternatively, paste in your base, find all the bags on the ground, and kill them/remove them.