I recently updated my server to the newest snapshot and I noticed that the items in the item frames had disappeared. So I went into a singleplayer world and it happened as well.
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Sorry, I was not aware. I just joined the site about 2 days ago or so. My apologies, will do in the future! Thanks for the information!
Duplicate of MC-45453 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.