No jumping can be broken

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.