After activating the mod, all props I had placed before (without the mod) were gone. In fact, they weren't gone, they just weren't visible.

With MoveIt and the area selection I could still select them and when I set them to the height (again with MoveIt) of a building or street nearby, they were back. If the mod is deactivated, ALL props appear again. If I then activate the mod again, the props I had previously changed will remain, but the unedited ones will disappear again.

I suspect that the mod sets the default height to 0 (or even null). This will make the props disappear underground. When I set the height with MoveIt, the Y value is set and saved. If the mod is deactivated this value is no longer used and the "prop Y-positions will fall back to terrain level" (as said in the mod description).

Maybe there is a possibility to set the default not to 0 but to terrain level? Or the problem is actually somewhere else.

Should I create an issue on github?