[REP+] Flat File Doesn't prevent you from taking curse room damage if it's taken inside of the curse room, or smelted before leaving.

[Hydroponic-Gardener]

There was a demon beggar here, he paid out with flat file, I smelted it. After he paid out completely (dark matter), i left but I took damage, even if the door, visually, had no spikes.

Uncertain if it's due to me smelting it, or, if it did not register in time.

[Joe2500]

flat file seems to work pretty strangely. it only applies the effect once you enter a new room, and if you drop it, the spikes remain gone for the rest of the floor (from what I remember)