Unable to forward The New York Times articles from Vivaldi
So any chromium is affected.
Probably could be useful to report this both to core team - don't mentioning vivaldi as they could ignore the issue - and vivaldi.
Sometimes adblockers or scriptblockers, 3rd party cookies off - and even the stock browser user agent - can cause strange issues, usually due site.
Seems to work fine here. Have you tried turning off any ad blockers, or other extensions?