The bug is that when anvil drops on a glass block, glass block does not break.
This affects both the glass panels and the glass block painted and in turn painted glass panel.
regards 🙂
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See http://minecraft.gamepedia.com/Anvil#Falling_anvils :
When anvils land on a non-solid block, they destroy the non-solid block rather than dropping as an item...
Should it break actually?