If you try to hit grass, flowers and/or any other kind of plant while flying (*both sprinting and normally flying)* in creative with a sword of any kind you stop moving for a very short second and then resume flying that way.
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Oh apologies, I didn't realize there was already an issue report about it.
Thank you for your report!
We're actually already tracking this issue in MC-157436, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
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