It happened only on the edit page/post screen.
It was still doing it when only these three plugins were enabled: WPForms Lite, WPFront Scroll Top and Yoast SEO.
I didn’t try without them enabled. My guess is that it would still be doing it without any plugin active.
I apparently had the same problem. The editor page for articles would keep reloading, making the page go blank again, I had to roll back until version 8.6.02.003 for the problem to go away.
I confirm it is fixed, thank you for handling this so quickly!
