So Timewalking has come back, and it seems like there are 2 issues with scaling.
The legendary ring effect, since it scales with itemlevel, has an abysmal proc, like 1% bonus damage and 1% damage proc.
Meanwhile, the mail T18 LFR set does not scale at all. it does just as much damage as it does at 95 as it does at 685.
There might be other set bonuses and items that are broken as well.