When I joined a server recently, the blocks fluctuated a lot and looked like the pictures below. It appeared that entities weren't affected. Completely restarting Minecraft fixes it, but if you disconnect and reconnect again, it happens again.
To reproduce:
1. Run Minecraft version 1.9 or newer
2. Join any server
3. Disconnect from the server
4. Join any server to see results below
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See MC-62958.

Thanks!