Hi!
The biggest problem is that the Android browser is not a single browser, but it’s vendor released, and seems like every old device has a different one. I have found a Virtual Machine image with android 4.2 pre-installed with the Android Browser, but everything is working for me with this one.
It’s probably a vendor/device or specific version related issue, I’m not sure how I’m going to debug this. At least mobile chrome is same on all devices…