If you have a wall and a fence running alongside it (on adjacent blocks), item frames can't be placed on the wall on a block that is right over a fence. If you first place an item frame and then place a fence, item frame will pop out.
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We're tracking this issue in MC-712, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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Possibly a duplicate of MC-712.