Spear's lunge enchant will sometimes cancel all upward momentum

When using a spear with the lunge enchantment, it’s common to jump around the same time as using the lunge ability to acquire extra distance while lunging. Through testing there have been some instances where the spear’s horizontal lunge momentum completely negates any in progress upward momentum that the player has. I noticed this when using jump boost 2 with lunge 3, it would appear that fairly often my upward momentum provided to me by jumping with the jump boost effect would be entirely canceled upon using the spear’s lunge ability. This would also occasionally happen without jump boost, but seemed to be more common with jump boost. This would happen at the normal tick rate but seems to be more easily reproduceable at lower tick rates.

Steps to reproduce:
1: Enchant any spear with lunge 3
2: Give yourself jump boost 2 either through commands or potion items
3: Run /tick rate 2
4: Create a jump gap with a gap up to around 15-16 blocks
5: Sprint toward the gap, then jump and use the lunge ability at the same time

The jump boost effect is optional here, although through my tests seems to increase the likelihood of this occurring
The timing of jumping and lunging is also suggested to be experimented with, most issues that I’ve found are when the lunge ability is used slightly after the jump, negating the upward momentum of the jump despite the lunge being performed during the upward travel of the jump’s momentum.

Expected Result:

Vertical and horizontal momentums of the jump and lunge respectively to be combined properly

Observed Result:

Vertical momentum gets canceled out occasionally by lunge’s horizontal momentum