Hi John40 thank you for the screenshots and level of detail here, it's very helpful.
I'm sharing this with the product team and will provide more insight when I learn more.
One workaround others use it having the Native OS notification answer or decline a call, without forcing the app into focus. If you have the notification for New Calls enabled in the app settings + Notifications allowed in the OS settings, you should see a window notification displayed in the bottom corner that includes the caller ID & and answer/decline buttons.