On blocks like doors which have a glass portion, overlays cause visual Z-Fighting issues. This doesn't happen when the design used is completely opaque.

Yeah, I've already noticed that some time ago but I didn't have the courage to fix that then... Looks like I have to fix it now 😄

Regards, Manu

I know this issue is open for more that a year, but finally I had some time... It's getting better, at least for trapdoors. It's a lot of work and pretty complex, though

Regards, Manu

Adding my here, more visually noticeable: