Flat items, such as tools or armor {not blocks} are invisible when dropped on the floor. They are only visible in fancy graphics mode.
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This is a duplicate of MC-45470. Please use the search function to check before posting in the future. If you could not find the original report, please comment with the keywords you searched for.

Confirmed, also having this problem. this appears to be happening to all non-square items I believe, not sure though.

Anything that is not a full block is invisable. Such as flat items when thrown on the floor, like swords, stools, foods, etc. Blocks are visable though.

Please comment on MC-45470 instead so people can actually find your comments.
— Thank you

happens with my item frames
Invisible items include coal, fish, swords.