The Yearn Cape that was recently awarded to players for playing on an event server appears solid green on Minecraft bedrock. This is not a localized visual bug, as the cape appears green for other players and I can see other players Yearn capes correctly. It is as if my Yearn cape is its own unique solid green cape.
This was not resolved. It may be a duplicate but if you view the bug report that the bot directs you to, it was closed due to not having enough information.