Display is blank screen in QQ browser

Display is blank screen in QQ browser,newly huawei mobile is so too. I press F12 show that the visibility of all ion elements 's css is hidden .
My ionic version is v4

For the starter sidebar project in ionic v4, it shows up fine in QQ for me. Are you using the latest build of ionic 4? I see your ng-version is “6.1.10” AFAIK its “~7.0.0” for me by default.

I have not tried with older versions of angular. The Changelog has a mention of angular version to use with @ionic/angular here -> https://github.com/ionic-team/ionic/blob/master/CHANGELOG.md#dependencies