Terrain Brush not always working?

I have multiple terrain sets that I’m using that have almost identical setups. A couple of them work exactly as expected, but the majority of them do not allow me to paint them in, the cursor stays red. Any idea what’s going on here?

This one works:

But this does not:

Here’s what it looks like when I try to paint (the red square is where it should be painting):

Any help would be appreciated greatly, thanks!

What other tiles are on the layer? If the tiles around where you’re drawing are empty, you won’t be able to paint terrains, because the terrain you’re painting with has no transitions to empty.

Instead of having a transparent all-red tile, you should delete the red terrain entirely, and leave only the green bits. This will allow these terrains to transition to/from empty directly, with no need for a filler tile.

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That did it! Thank you!