@mozsquib I think here is the problem that my search results didn't come out. I found when I tried to tap on the search box, my tapping didn't triggered the "click" event, so Music app did not change to MODE_SEARCH_FROM_TILES, and although the results were found, they were still hidden and not displayed on the ui.

This problem can be 100% reproducible on device, and sometimes happen on desktop client, have you tried to test it on the real device?