It seems that the only way to make the tooltip descriptions go away is to drag your finger out of the button. When you select a tool, ending your touch on the button, the description still stays up, and that shouldn’t be the case. There should be a check to see if the touch ended in addition to checking if the touch left the button.
Repro:
- create a tool with a tool tip, and put that in the starterpack
- play game on a mobile device
- touch the tool to select it, and the tooltip should remain