When a gravity-affected block is falling, the animation for it is very laggy, even though the rest of the game runs smoothly. All that is needed to reproduce is to mine a block underneath sand or gravel and you will see the laggy animation. I saw this bug reported before for a similar version, 1.17.41 Patch 17, but it was on PS3 and the report was marked as "cannot reproduce," but I am still encountering this issue.