I'm getting transparent doors OptFine in combination with malisisdoors 7.3.0 and malisiscore 6.4.0. This happens for all doors. Also the ones from vanilla that are replaced with this mod. I was trying to compile your mod myself but apparently the version of malisiscore in git is not compatible with the malsisdoors in git. Or at least there seem to be many mismatches with where packages should be.

I was trying to have a go at fixing this myself. For example by adding shouldRenderInPass() to the door tile entity.

Let me know if I can help and how I can possibly compile this myself. Thanks

Hmm, I managed to rollback git versions to the last released version and shouldRenderInPass() does not fix the issue. I'm now thinking it may have to do with the fact that you render these after all the rest has been rendered:

public void onRenderLast(RenderWorldLastEvent event)

As the door renderers implement IRenderWorldLast. Any reason why the doors have to be rendered so late? This might confuse optifine I think

Problem solved. It is a bug in Edi's shaders