When recasting Reality Rift on the target, only the duration gets refreshed. The slow values do not update.

Repro:
1. Cast Reality Rift on level 1, 2 or 3 on an enemy
2. Level up Reality Rift
3. Cast Reality Rift on the target again, before the debuff of the previous cast expires

(note, you may need help from an allied KOTL's Chakra Magic, or an arcane rune and the cd reduction talent, for a lower cooldown)

Result: The debuff's duration gets refreshed, but its values not. The slow stays the same after refresh.

Expected: When refreshed, the movement and attack speed slows should update to the new level.