Upon opening files/different scenes, some materials are randomly loading as completely transparent in standard default shaded viewports. They're invisible but the objects are still selectable. If I apply another material to them, then they reappear. Applying the buggy material again, they will disappear. In other instances, if I restart or load the files again, the materials may load without any issue.
My materials have been continuously updated from older versions which I suspect may have something to do with this, but again others that are older are randomly okay. Doesn't appear to be any reason. If I recreate the material from scratch and apply them within the same scene that is acting up, they will display.
They all render just fine regardless of visibility.
Here's a material that is acting up randomly. All other materials are working/seen fine within the current scene. If I open it up again, it will probably display fine again: