the ender dragon skin's cape does not have a elytra texture, the skin can be found in the 1st birthday skin pack.
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Thank you for your report!
However, this issue is Invalid.
You have posted a feature request or a suggestion. This site is for bug reports only. Capes that come attached to certain skins aren't meant to have special elytra textures.
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Also occurs on the most recent version of bedrock edition.