When you are standing in a glasspane and someone shoots at you with a Bow, you get Damage by the Projectile
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Where's the bug?

Please provide screenshots.

This sounds like a WAI.
This issue duplicates MC-88491

Incorrect duplicate link, this sounds like the hitbox of a player going through a glass pane making another player on the opposite site able to shoot the first player

Fixed the link
Did this happen in SMP?