When holding the jump button on a device with touch enabled, changing the humanoid’s JumpPower to any different value would deactivate the jump button. Players would have to re-press the jump button to reactivate jumping.
Demonstration video: https://www.youtube.com/watch?v=fB4owsJrCdg
Reproduction place (uncopylocked): JumpPower / JumpHeight change test - Roblox
Expected behavior
The jump button would continue to be held down (activated) after the humanoid’s JumpPower changed. This correctly occurs when the humanoid’s JumpHeight changed.