At these photos there is the bug. At first you can see the armor stand with elytra and a totem of undying and some armor even though it doesn't seems to be there the then same but with a turtle shell then without the elytra and with a chestplate and then the armor stand is broken and all the items are to the floor.
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I think armour is broken in general, I can't see it on players either in 1.14 beta

I think armour is broken in general, I can't see it on players either in 1.14 beta