can't remove pavements and graphical transition issue

[Miretta 1,415]

I was wanting to remove some corner pavements I made that are near a highway, but only touching it and I can't remove them.
Not only can I not remove them (without removing the cateye) they also transition switching the materials on where they are touching?

I'm not even sure what of this is exactly a bug or if I need to expect to not be able to change pavement adjacent to a highway.
It works fine to destroy pavement adjacent to the protection like that on my deed, just not in my perimeter.

[Miretta 1,415]

oh, i found out the next diagonal cateye is protecting those tiles, so now it's only the transition between 2 tiles somehow switching