I tried using debug mode because the loot didn't respawn for some time.
I noticed that the map's "zone" type was changed to DeepForest.
(Only some modmaps seem to have changed. These mode maps are originally set to town.)
I don't know the exact cause, but I think that the problem may be that I often used this program. maybe.. not sure
https://lordikol.github.io/PZ_MapCleaner/
Is there any way to reset this?