Armor stands just started showing as pink. There was an old bug report on this but it was never resolved.
MCPE-90577
Pink armor stands
Resolved
Duplicate
0
Max McCabe
(Unassigned)
Unconfirmed
Xbox
1.16.1
Retrieved
Thank you for your report!
We're actually already tracking this issue at MCPE-53105, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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