When I'm lagging, my viewpoint keeps bouncing to a fixed other position that I wasn't even looking at recently. Attached is a video where the issue occurs twice within 10 seconds. However at its worst it happens repeatedly when trying to turn the player in a direction. The only "workaround" to not keep getting bounced when that happens is turn all the way around in the other direction.
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Environment
Linux Mint 19.1
Ryzen 3 1200 quad core 3.1GHz
GTX 1060
16GB RAM (4 assigned to Minecraft)
Thank you for your report!
We're actually already tracking this issue in MC-144107, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.