When one player has the founder's cape equipped, all the other players in the game who have elytra have the founder's cape pattern on it.
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Thank you for your report!
We're actually already tracking this issue at MCPE-53595, so I will resolve and link this ticket as a duplicate.
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This also affects mobs wearing elytras. The player with the cape needs to be wearing an elytra for the same elytra design to show on other players/mobs, but the design won't go away on other players/mobs if the player with the cape removes their elytra. The bug is still in 1.16.0.