When in survival mode, a spider mob can harm you through glass panes by walking towards it. Not sure if other hostile mobs can do this but the spiders are the only ones I have encountered. THanks
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Probably intended as the actual hitbox of a spider is not exactly the same as the "hit/attack"box, making him able to move his "attack"box through the glass pane because its so thin that the hitbox doesn't hit the glass and the spider can hit you.