When you recall a unit (through Zhonya), does it recover to full Might (for that turn) after getting debuffed?

No, a unit recalled by Zhonya’s Hourglass does not recover its original Might; it retains any debuffs (such as might reductions) that were on it.

According to RiftJudge FAQ 1357, when Zhonya’s Hourglass triggers to save a unit, the unit is recalled and healed (damage is cleared). However, "other effects like might reductions from Stupidify remain on the unit."

Furthermore, Rule 453.1 confirms: "Unless otherwise stated by the source of the Recall, Damage, Exhausted Status, Buffed Status, and applied Layer alterations will all remain unaffected by a Recall."

To summarize:

• Damage: Cleared (the unit is healed).
• Debuffs/Buffs: Retained (they do not reset).
• Exhausted Status: The unit becomes exhausted as part of the Zhonya's effect.