I already know that Xamarin Forms sample project adds Internet permission in AssemblyInfo, I have removed that long time ago and there were no problems with internet permission until I have added this library. And when I removed the library and swaped RichTextEditor with regular Editor and compiled APK, problem was gone and Internet permission hasn't been added to new AndroidManifest (located in APK). Obivously there is a problem with SfRichTextEditor library, and not my code.
Here is how AndroidManifest looks when I use library:
Mediafire linkHere is how AndroidManifest looks when I don't use library:
Mediafire link