can confirm you are supposed to be able to jump when sprinting but there may be an issue with your controls.

certain things do not work when holding shift i have learned, like pressing the button to equip weapons will not work until i let go of shift. - same thing happens if i try to press a hotbar number while holding shift, game recognizes "!@#$%^&*()" as inputs rather than their numbered alternates.

im thinking this may have something to do with your problem, have you changed the button you use for jump to anything that has a shift-alternate form? like a letter for instance or a number?

because the game seems to recognize case sensitive inputs, so pressing shift "e" will make it count an "E" press rather than just "e"