When you place redstone dust on glass, redstone signals can't be transmitted downward.
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Thank you for your report!
We are tracking this issue in MC-3311, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as Works As Intended, which means this is not considered a bug and will not be fixed. Please do not leave a comment on the linked ticket.
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Duplicate of MC-3311.