Wasn’t Appearance what the texture was on the old weld/glue/stud Parts?
Roblox announced a while ago that they were deprecating that.
I know just a few weeks ago I had an old place with Parts with those properties on it and they were still visible, but if I set them all to None (no texture) the Appearance dropdown did just as you said.
If you need this you may be able to find an old Model in the toolbox with those textures on the Parts. You may be able to copy them and use them that way.
Either that or get the textures and place them on the Parts instead of using the Appearance.