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so, from my deductions
as far as i can tell NoScript is causing issues with the new "experimental privacy mode" feature
switching NoScript off allows the feature to work
having it on the feature does work but then requires a reload of CoSo and after that it is hit and miss wither it continues to work
issue is on ChromeOS CoSo PWA/tab with NoScript extension
firefox with NoScript enabled on mobile the feature worked for me