Zombies And Other Mobs Can Still Harm Players Or Villagers When On The Other Side Of Iron Bars Or Glass Pane.
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This has happened to me as well. We play 1.16.1 on Xbox one, on a Microsoft Realm. we have an underwater monument that we have taken over, and drained the water out of. the bottom 'farm level' which is between the ocean floor and the bottom of the monument, has a mix of glass blocks and glass panes between the pillars so that we could remove the water, bring in animals and set up farming. the glass blocks frame along the bottom with window panes above that filling in the rest of the open area.
With all of the panes in, drowned can still hit me through the panes don't think they can through the blocks)