Can't sneak and jump if the jump key is on the numpad

The bug

Normally, when you press the jump and the sneak key, you'll jump and sneak in air. But, if your jump key is on the numpad (I'm lefty so I use the right zone of the keyboard), you'll instantaneously de-sneak if you press the jump key.

This bug is quite annoying because I'm a PvP player and the sneak is very important for sneaky attacks

How to reproduce

1. Set your jump key to a key of the numpad (I use 0 for example)

2. Press sneak in game

3. Then, press jump

4. You will instantaneously de-sneak and you will not jump