Urgent Call "Recover" is regeneration, Time of Need "Recovers" is not regeneration. Why?

Reproduction:

Equip Titanrot Cataphract Maraketh Cuirass, applying: "You have no Life Regeneration"

Allocate Urgent Call, gaining "Recover 2% of maximum Life and Mana when you use a Warcry"

With Blood Magic and Urgent Call allocated, use any warcry.

Expected: Warcry life cost is removed from current life. 2% of life is recovered.
Actual: Warcry life cost is removed from current life. No life is recovered.

Why this differs from expectations:

Time of Need reads "Blessing Recovers X Life and...".
This recovery is still applied when Titanrot is equipped.

This leads me to believe either Time of Need recovery should not be applied, or Urgent Call should be applied when "You have no Life Regeneration". As is, I don't understand why it works for one but not the other.

Urgent Call's recovery shouldn't count as regeneration. All sources of regeneration specify that.

So we agree this is bugged based on the wording of titanrot?
question is, what is bugged, titanrot, or the recovery?