You should start collab immediately after end of part 2. Don't awaken the Garuda. If you awaken Garuda, then even after collab and amabie quest, time loop will not trigger.Help, I can't start the time loop.
I already done with collab, done with Amabie side quest, have Saki, done with Cassandra and Candy, but still can't trigger the event even after talking to Amira.
The only thing that comes to mind is that I try to start it AFTER the great decision.