Steps to reproduce:
I am logging in with my account and I am trying to find some file on that page. I have it and then I change tab. Sometime when I go back to that page it's empty, I hit reload and nothing happens also if I try compatibility mode I get a slow loading page without the files again.
In Safari it worked/works ok.
It should work everytime, I am using nextcloud and owncloud for some year and with Safari didn't had such issues.
Orion and macOS:
macOS 11.6.1 - Orion last public release 0.99.107-beta