I recently experienced this as well, but don't remember it from before when I first began revising my solution to work in Go. No answer yet, but I agree that it is annoying. In my solution, I use a web viewer to pull up location map from Google. The map won't even load until I click the grey overlay.
I do know that there there is an option to disallow interaction with the web content, and I tried toggling that to see if it made a difference. It did on Pro, but seems to be ignored in Go. And it didn't affect appearance of the refresh overlay.
I never noticed this until I read this post! :) Yep, there it is on my FMG solution using the web viewer. I as well do not see the reason for this.