If you put two layers of walls on top of each other, you get little gaps between them and these kind of "pillars", which I think would be great if it was fixed to leave a seamless texture. However, these gaps are sometimes wanted, and I think you should be able to get them by right-clicking them with a pickaxe. This would add an NBT tag "gap", or something similar, to the wall and change its texture.
Image is here (credit to u/yummymario64): https://imgur.com/a/xD8RhRQ
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