Status of HRM and Training Load?

There are a few threads with similar issues but I haven't seen any definitive conclusions.  I am on firmware 3.07.

Does using an external HRM cause exercise/training load to stop working?  I am considering picking up the Polar Verity Sense, but I keep seeing threads that this is causing problems with load reporting and that Garmin/Polar are blaming each other.  Does anyone have this working successfully?