Physics items that have been picked up and dropped, and then given an I/O signal to respawn will respawn, but the respawn delay will keep going, and then when the delay is finished it will respawn a second time.
Place down a physics item and give it a spawn delay. Then set up something with I/O that respawns the item. Pick it up, then respawn it with the I/O input. Wait for the respawn delay to finish.
I expect for the physics item’s respawn delay to stop after the item respawns.
The respawn delay continues even after it respawns, causing it to respawn twice.