So, I am getting an FPS drop up up to 20 FPS when mining Sandstone when compared to other blocks such as Stone.
I've uploaded an unlisted video here showing the FPS drop. There is a considerable stutter when mining sandstone as well that is not present with any other blocks so far.
RaysWorks started noticing this on server for 1.14.1, and uploaded this clip. https://clips.twitch.tv/MagnificentTardyGerbilUnSane
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Yes. In testing, it seems that the easier the opaque block is, the higher chance for lag is when on servers (This doesn't happen in singleplayer interestingly enough). During what I call the "Flicker period" there is also a good chance to get pushed off to the side when digging straight down on a 1-wide pole of blocks. Seems to only happen with opaque blocks when using a pickaxe.

Looks like this is no longer just Sandstone. Placing / removing certain blocks will cause lag spikes.
Also, there is a chance to be pushed off a pillar, If you make a one-wide pillar out of an easy-to-mine block in survival, the flicker moment will let you drop down but then get pushed off to the side. Still occurs, even now in 1.14.1.
Is that still an issue for you in 1.13.1?