To start of my sneak attack doesn't scale or at least as far as I have played. I am a level 4 rogue right now and the ability still says 1d6 for a sneak attack when normally it increases by another dice every odd level.
So it actually does scale the sneak attack damage by level but definitely not like the 5e handbook says to. If you mouse over the damage done in the message window after you use sneak attack, there will be two entries, one for the main attack, and one for the sneak attack damage. Here's a picture of the sneak attack damage calculation
https://prntscr.com/uwzo11So instead of rolling multiple dice depedning on your rogue level, it rolls one d6 and then multiplies the result by a modifier equal to the number of sneak attack dice you should get based on the handbook at any given level. This is a really silly way to do it in my opinion and makes sneak attack damage much less consistent as your levels increase. Sometimes you'll hit like a truck (when you roll a 6, multiplied by the modifier) or you'll do close to nothing (roll a 1 multiplied by the modifier). I'd much rather them go by the 5e handbook for sneak attack damage to keep its damage much closer to a normal distribution rather than the current uniform distribution.
