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There, the texture properties are actually... texture properties. That is, how it should be applied. For example, the ghost model has a special property needed to support semi-transparent textures. Perhaps something similar is set here too.
And by "empty" texture, I mean not null (because then the mountain would be covered with a "standard" texture), but rather completely transparent.
If it's not too much trouble, could you please show me on a screenshot where exactly to adjust the texture overlay parameters? I'm talking about the ground texture. It would be best to show it on this map so I can immediately understand what exactly has been changed. I would be very grateful:)
On the other hand, the issue might not be just that, because not all mountains on the map are transparent, only certain ones.