When in 3rd person in spectator mode, if you look at stained glass through your head it appears invisible. This also affects ice, but not regular glass.
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Relates to MC-168137
Thank you for your report!
We're actually already tracking this issue in MC-165958, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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