Character blinks when flying with elitra

What edition of Minecraft do you play on?

I was playing java edition 20w45a on a Windows 10 laptop

Thank you for your report!
However, this issue is actually already being tracked in MC-111516.

Quite an old bug! Make sure to vote for it and watch for any updates on the issue!
If you have any additional information you'd like to add, please add a comment there.

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