Does a temporary unit dying during the beginning phase create a chain start that can be reacted to, and can Zhonya save a temporary unit from dying?

Ruling: When a temporary unit dies during the beginning phase, this is a trigger that goes on the chain and can be reacted to by either player. Zhonya is a replacement effect (not a reaction) that will save the next unit which dies regardless of how, where, or which unit it is, so it will trigger for the temporary token and prevent its death.

Nuances:

• Zhonya cannot be at a battlefield; once played from hidden it's immediately put into your base as gear cannot be at a battlefield
• If you save a unit with temporary using Zhonya, the temporary status stays on the unit until it changes zones, so it will still be killed during your next beginning phase