I also suppose we didn’t have that issue before we switched to 5.1 from 5.0 so I don’t recommend such switch. But it’s also possible it was even in 5.0, we just didn’t notice it as we did lower amount of testing back then. Though the first video with the desync we have was just after update to 5.1.
UPDATE 15/10/23:
Same problem happens in 5.3. Again, don’t recommend going away from 5.0.