I've noticed that on vanilla planets, shift-placing works well with this mod, as it automatically places the last valid "foundation" tile. However, this is not the case for Moshine (https://mods.factorio.com/mod/Moshine).
I don't just want to add all the natural tiles into the valid tiles list in this mod's settings. The current workaround is to place tiles always before. It works, but it is tedious.

The latest release should resolve this. Thanks for your post.

I've checked in-game, then your code, and I don't find the reason why the "moshine-hot-swamp" still does not quite work.

With the latest update, it works great. Thanks for the quick fix!