KJay
Newcomer
I'd noticed this issue when I started playing in 1.5, and I went to check out if it was possibly fixed for 1.6 but unfortunately it's not (and now that I've looked it seems like it hasn't really been noticed much by others). I found this issue when building the obelisks on my farm, which cuts underneath the hillside texture (my mountain obelisk specifically) right above the mushroom cave entrance. No mods. I'm assuming it's some layering issue, so hopefully it's a simple fix.