I have tested this on minecraft servers, and this only really matters for parkour. However, this can still be very infuriating as it can be used as an exploit on servers like this, although there is no other effect. This does NOT affect survival minecraft, and only worlds where cheats are enabled. In summary, it would be nice if this was fixed, it affects how jump boost functions and this does not need to urgently be fixed.
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violine1101
migrated
Thank you for your report!
We're actually already tracking this issue in MC-10755, 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 to see if the issue has already been mentioned.