Found but not picked up items can be rerolled by changing the focus category and turn on and off the foraging modus.
Version 41.78.16
Singleplayer
No Mods
Occurs on old and new saves
Reproduction steps:
enable Foraging modus and find one or more items
don't pick them up
change the focus category
enable/disable Foraging back and forth
eventually the items will change to items from the chosen category