Garmin has pushed a new update to a few of its latest smartwatches. Arriving as the second update in as many weeks, Beta 9.16 disables ECG functionality without warning or the ability to download a rollback file to return to stable builds.https://www.notebookcheck.net/Garmin-disables-ECG-functionality-on-new-smartwatches-without-warning-via-new-update.795676.0.html
It's no big mystery. As ECG has to be certified, it doesn't make sense to have to delay each beta build with having it recertified...
Non story
This is standard practice if you decide to sign up to the beta program. Nothing new here.
It's not without warning. I read an article last week warning that beta software would disable ECG. Do your research before updating to a beta.