I think it's probably a blacklisted GPU since it is dropping down to canvas2d. When device's GPUs are buggy/unreliable/insecure Chrome will not use the GPU which means it won't use WebGL and that usually results in poor performance. Generally this only affects a few % of devices, and it should be going down.
Does the same project show "webgl" if you run it in the Chrome browser instead? If it only shows canvas2d in the APK then that might be related to a Chrome bug report I filed a while ago.