I don't know for sure if it's a bug or a feature, but in the latest snapshot, F3+Q reloads all chunks and F3+A shows the list of debug keybindings.
This is inverted in 1.12.2
And no, it's not because my keyboard is in the wrong azerty/qwerty mode. I checked that.
Linked issues
Comments 3
Found the issue I was thinking of: MC-121278, "Keybindings (p.g. Ctrl+A) are being mapped to the US keyboard layout even if you're using another layout"
Still, what layout is your keyboard in? Is it an azerty keyboard? I somewhat remember there being a report about the game using the wrong layout.