Another factor that males me think that the format rather than the bit rate is the problem: the VP9 video played just fine in the Wikipedia App on Android, but not in browsers on Android.
Pine
My understanding is that one of the points of going to VP9 is that it's good at varying its bit rate depending on available throughput. If bitrare really was the problem with the VP9 version, that suggests that VP9 failed at one of the reasons for using it in the first place.
Pine