@Vlad
I've updated my original submission to include installed browser plugins and a video.
This is now happening on both my M1 MacBook Air devices. The only difference in the hardware is the RAM: 8 GB vs. 16 GB.
In the video, you can see what encounter when I wake the computer from sleep. The tab at the bottom no longer displays the web page and the address bar is empty. You can also see that this behavior is not consistent when I select ta tab further up the list.
Let me know if I can provide anything else that would help.