By default, the key to activate flight is Z.
But on Azerty keyboards, the Z key is instead of W on Qwerty keyboards.
On Azerty keyboards, most of players rebind their keys to move foreward with Z.
So, in debug mode, each time we want to move forward, we activate and deactivate the fly.
It's unplayable, creative mode can't be used on Azerty keyboards.
Each time, you have to go to the Windows settings, switch the language configuration to English and reset the game in default settings to redo everything afterwards when you no longer want creative mode.
It would be enough to add the possibility of rebind the key for the creative fly.