AVPageView text frame in Adobe Reader

Felix G.

Dear NVDA community,
when I open a pdf file with Adobe Reader, focus tends to land on
something called AVPageView text frame. The arrow keys do not read
anything in this control, and it has no child objects. When I alt+tab
out of then back into Adobe Reader, I can read the file just fine.
Observed with NVDA 2020.4 and Adobe Acrobat Reader DC Continuous
Release | Version 2021.005.20048.
JAWS does not have this problem.
Any advice is appreciated.