Theoretically 16, but I can’t get it to work with more than 10 myself before I get this issue.
Remember this is textures, not layers, so it also counts specular, normal, roughnessmaps, etc.
If it’s not staying like that permanently when you paint a new layer on a component, it will only need a short moment to apply it.
Then you can paint live from there again using both layers, until you either entirely remove a layer or add another one.
Just to be clear this is my paint textures same numbers as layers.
I waited so long and didn’t come alive, I end up by removing the components that making this and put new one, but not always worked that way, I tried not to paint so much texture in these specific components to avoid this from happening.
But I still didn’t know why is doing this.
Maybe I should try it in on a new project and see!