First posted in the .575 topic, hoping for a response here, the issue still persists for me on this hybrid and I cannot find another mention of it:
Issue
Device Model: SQN100-3.
OS: 10.2.1.575, with .641/.725 .bar package and .1791 Runtime.
Install method: clean install of .575 (no restore), loaded .1791 Runtime, loaded .641 files, loaded .725 files. I only loaded the updated files, and rebooted after each step to be sure.
Issue/Question: Voice Control not opening (mute button/app icon, both do not respond), does not show as 'running' in App Manager.
Cause: Unknown, I did not load any .bar file related to Voice Control, (afaik) they are still the .575 version.
Attempt to resolve: Rebooting (restart, and "hard" reset), turning on/off in Settings app/changing settings. Mute key still works for media control.