I'm currently bumping into the issue of iframe not working with SharedArrayBuffer support enabled, and I need it for steam page wishlist widget embedding. I was wondering if a fix is in the works for this issue specifically?
Unfortunately every iframe on the page must participate in the same security headers, so if a third party platform’s iframe embed doesn’t support it then it won’t load. You’ll have to use another solution to embed the widget into the page, like a link or image.