Hi Thomas,
I will pass this message to the team and get back to you.
Update
The team has already researched this issue based on https://learn.microsoft.com/en-us/answers/questions/256776/accessibility-feature-of-bing-map-control and the issue seems to be in the implementation of NVDA and has been reported to them as of 2021 or earlier. You can see that other tools do not have this peculiarity.
It is my understanding that Microsoft will not be issuing a fix from our side as this will likely impact other Accessibility tools so we recommend doing the same and leveraging a different option than NVDA until they implement a fix.
Sincerely,
IoTGirl