If you keep your keybinds as default you can jump while sneaking. I've personally always played so that ctrl = sneak and shift = run. When keybinds are this way you can't jump while sneaking.
Comments 2
It did works perfectly fine with default controls. It was not a keyboard issue. But that made me think it still might have been nonminecraft issue and it was. Found out that Microsoft decided to add a short key combo ctrl + space bar to their powertools without asking. Disabled that and it's works again. Sorry for the false report.
Tried the default controls and holding control and jump? If that doesn't work, this is MC-54194.