When a unit with boosts is returned to base by Zonia (or revived by Sett's passive), does it keep its boosts?

Ruling: Units keep their boosts when returned to base by Zonia or revived by Sett's passive. Only buffs are removed by Sett's effect, not boosts.

Nuances:

• Modifications to game objects are only removed when they change zones to/from non-board zones
• Zonia and Sett effects keep units on the board, so boosts persist
• Debuffs (negative stat modifications) also persist through these effects
• When Sett revives a unit, only the buff itself is removed, not any boosts that were applied