There are at least two abilities in TWW S2 M+ that cause a slow effect that are not being removed or prevented by Blessing of Freedom.
In Priory of the Sacred Flame, Baron Braunpyke’s Castigator’s Shield is leaving a slow that is not removed by Freedom.
In Operation: Floodgate, the stacking debuff that the trash mobs put on (I believe it is the Black Blood Wound) has a 3% slow per stack. Blessing of Freedom does not remove the debuff nor does it prevent the application of the debuff. These two cases work opposite to how Freedom has worked in all other past content aside from unique cases/bugs.
Another one that might be due to how the debuff works - the Venture Co Architect in Operation Floodgate casts Nailed, which both roots and puts a bleed on the target. The debuff doesn’t show that it is a root however freedom does remove the root aspect while leaving the bleed.