iCloud -- warn when browser version out of date

Description of the issue: www.icloud.com does not load on browser version 1.73.101 (except in a private window), but does load on browser version 1.73.104.
How can this issue be reproduced?

Version Window Type Extensions Result
1.73.101 normal window my usual www.icloud.com does not load
1.73.101 incognito window 2 / 2-dozen www.icloud.com loads
1.73.104 normal window my usual www.icloud.com loads

I have some extensions set to load – but watching the Network inspector, I’m unable to determine what’s blocking page load on 1.73.101.

Expected result: page loads

Brave Version( check About Brave): 1.73.104 Chromium: 131.0.6778.204 (Official Build) (64-bit)

Additional Information: