Removing the white background and having a full size app icon?

I am finalising my app and what to set the app icon. However, I fail every time and tried so many app icon generators... I have my app icon which is 3000x3000 and has no background. Whenever I try to generate my app icons I select sharpe none. The result is always the same (you can find a screen below).

How can I have my app icon like the Google Maps icon or the clock icon? I want to have my bee centered and the background simply should be cut of depending on the icon shape..

This is an website I have used e.g.: https://romannurik.github.io/AndroidAssetStudio/icons-generic.html

My AndroidManifest.xml is also using the correct icon:

<application
  ..
  android:label="@string/app_name"
  android:icon="@mipmap/ic_launcher"

This was recently asked, and the answers were it had to do with the new adaptive icons for Android 8.0 You will have to create your own adaptive icons, see https://developer.android.com/guide/practices/ui_guidelines/icon_design_adaptive for instructions.
BTW, 3000 x 3000 icon is crazy, and has no reason. Legacy icons should be 48dp x 48dp, so highest resolution should be 192px x 192px.