At least I can tell you that I have exactly the same problem. I was thinking about executing the tests manually on Firebase Test Labs to get access to the files stored on the test machines. Maybe that way I can find out more what’s going on.
But I think it would be really helpful to get a statement here from @bitce or other bitrise staff members since this should be common problem when working with the new Virtual Device Testing feature. I’ve another post where I tried to work around that using the AVD Manager, but also without success (and I’d rather use the VDT instead of AVD in terms of conviencene and execution speed).