When we put a stained glass block or pannel in an item frame, we can actually see through it the block behind.
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Can confirm It works for leaves and other blocks as well
Thank you for your report!
We're actually already tracking this issue in MC-162042, 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.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
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