Can you please file a bug here:
https://source.android.com/source/report-bugsand then update this thread with the bug number? I'll then attempt to contact the partner.
It is likely a device-specific bug. For more information about these kind of device-specific glitch bugs,
(specifically 3:30 defines glitches/popcorn and the relationship between glitches and latency,
but you may need to view the whole video to get the context)
We are working on automated testing tools to catch these kind of device-specific glitches earlier
so they can be fixed, and providing a way to surface them to our partners.