Send Tab to "Nightly" on mobile opens in "Firefox Focus" instead

Sending a tab and choosing “Nightly @mobile” from the list, the tab still opens up in “Firefox Focus” instead, when I tab the Android notification. Note, Focus which is set as my default browser.

  1. Why doesn’t it open in Nightly as expected, due to me explicitly setting it, instead of my default browser?
  2. Why do I get a (accidentally) dismissable notification instead of the tab simply opening in Nightly once it is opened?
  3. Where should those question be filed? Bugzilla?