When I give a block/item to an invisible armor stand (invisible as in with the command /effect invisibility 1 1 true - also I used tagged+named armor stands, so maybe that has to do with something?), the block/item shows up on screen and moves with the player. It is temporary- the player has to look in the right place. It has a varying size too.
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Thank you for your report!
We're actually already tracking this issue at MCPE-39779, so we will resolve and link this ticket as a duplicate.
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