[2.1.12] Tile with destroys_dropped_items == true does not destroy items on the ground after changing tiles

[MeteorSwarm]

This bug is visible if you load "Muluna, Moon of Nauvis" version 2.6.13, though I suspect this affects all tiles that destroy items. Normally, Muluna dirt destroys items that touch it. However, if one places a tile on top of Muluna dirt that does not destroy items, items can accumulate on if inserters are set up to drop items on the ground. After removing the tile with items on the ground, I expected the items to be destroyed, but that did not happen.

Lunar soil normally destroys items. By placing a tile that doesn't destroy items on the soil, then removing it while items are on the ground, items can exist on the ground where they should be destroyed.

08-02-2026, 19-21-00.png (1.08 MiB) Viewed 67 times

To reproduce:
1. Load Muluna, Moon of Nauvis 2.6.13 on Factorio 2.1.12.
2. Teleport to Muluna with "/cheat muluna".
3. Place a chest on the ground, and fill it with items. Place an inserter that removes items from this chest and places them on the ground. Notice that with no placed tile on the ground, items dropped are destroyed.
4. Place stone bricks on top of the inserter's drop tile. Items will now accumulate on the inserter's drop tile, soon causing the inserter to stop.
5. Remove the stone bricks. The accumulated items will not remove themselves, and the inserter will remain stuck.

This issue makes Muluna and any planet that relies on "destroys_dropped_items" less playable, because it can make trash sites accidentally locked up harder to fix.

[Rseding91]

Thanks for the report however this is not a bug. The system being described only applies when items are placed on the tile that is marked to destroy dropped items. It was not implemented to retroactively destroy items when the tile is placed.