"Fixing" the Stuck Tooltip is not likely any time soon, since the issue is more in Chromium itself, which ZAPP is built upon.....

However, Disabling the Tooltip is a Feature Coming to a World Near you Soon.

If you open an SR and reference Defect#1116255, they can get you an FTF for ZCM 2017 Update 3 that creates an option to disable those popups.
This is expected to be introduced as feature in ZCM 2017 Update 4 FRU1 ( This is the next update AFTER Update 4...which will likely ship in the next couple weeks.)