In logcat I see this error:
I checked the headers which are sent, and indeed, it's is not present.SystemWebChromeClient
file:///android_asset/www/index.html: Line 0 : Access to XMLHttpRequest at from origin 'file://' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
Did you change your server config recently or did Lineage's internal web browser's security settings change? Either way, a fix would be appreciated.