There is a floating item in armor stand's hand when armor stand has invisibility effect.
[media]
steps to perform:
Place a armor stand
Choose an item (idk why but it must be weapons, other items won't show up)
Equip armor stand with item
Effect armor stand by invisibility (by command or potions)
Walk around!
I also used this to mix items by placing different items in different armor stands and throwing a potion of invisibility at them. To watch them clearly, place another armor stand.
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is duplicated by
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It's not duplicate. It's sorta different. You shouldn't use splash potion you can also use effect command
In that case it may as well be considered intended

And it's an crossbow bug. Because I tested this on other versions before crossbow and there wasn't such item jumping thing but with crossbow update items can be combined.
Reopened for review.
Maybe I just don't understand the issue. Armor stands can hold things and also turn invisible, how is the crossbow involved and what is the bug?

Let me tell it in this way:
Armor stands lose the items place holder when at least one of items are a loaded crossbow

I changed the title as I figured out that it's not important to one of items to be crossbow (I think because I didn't cleared the cache) but it only happens after crossbow update
Aha, now that I actually tested it I can confirm. I attached a video, as movement is key in understanding this issue.
Given the updated repro steps, I believe this is the same issue as MCPE-39779.

Ok it still effects in 1.11.0.5 but with slightly different details. Items that can be combined now are all items and blocks (not just horizonal items like before) and when all of them are in a armor stand hand, they will shake when you move (previously it was stable) and like it says in mcpe-39779 , items of entities also lose their place holder but they won't attract to armor stands (also I've first reported this bug why did you choose mcpe-39779 as main bug and I am a duplicate of it?)