Wrong Rocks' Double Slabs Textures

I was traveling on my project world and I saw that there's a double stone slabs and I don't remember putting it there.Later,I placed double stone brick slabs and turned into double stone slab.I decided to report the bug and I realized that there's more,all rocks' double slabs turned into a double stone slabsThe debug screen showed a purple/pink text"Round trip different" and "Block:minecraft:double_stone slab/6.

*What I expected to happen was...:
When I placed rocks' double slabs,it would turn into block's default texture.

*What actually happened was...:
Instead,it's textures turned into double stone slab's texture.

*Steps to Reproduce:
1.Place any rock slab.
2.Place another the same rock slab on the top.