Elytra not work correctly

We do not have enough information to find the cause of this issue.

Please record a video of this happening and attach it to this report.
If you are on Windows, you can use Windows+Alt+R to open a built-in App for recording game footage.
In case you don't have a program to record videos, we recommend using the free recording software OBS.
In case the resulting video file is too large to be uploaded to the bug tracker directly, please upload it elsewhere (e.g. as unlisted video on YouTube) and link to it here.

_{This issue has been temporarily closed as Awaiting Response. Once the requested information has been delivered, the report will be reopened automatically.}

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For Windows+Alt+R to work, you must be using Windows Ten and have the game bar thing enabled

I plus the video now. Sorry, i use finnish lanaguage.

You are not pressing space fast enough.