All debug stuffs like line gizmo lines and texts suddenly became rendered by main camera - and I have no idea why is that. I was working on CustomPropertyDrawer while it happened tho but I’m not sure can this be connected. Googling gave nothing so far, any ideas maybe?
You have “gizmos” toggled on. Top right corner of the Game View window. Just toggle it off. 
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Omg haha 
It’s embarrassing but I totally forgot about that, thanks!