Quick answer: Unreal Iris rollback replay missing actor respawn events? Spawn events aren't part of state; rollback can't replay - record spawn separately.
Player rolled back; an enemy that spawned during the rollback window doesn't reappear.
Record spawn events
Spawn timestamps stored separately. Rollback re-fires spawns at appropriate ticks.
Or skip rollback during spawn windows
Hold rollback until the spawn settles. Window-based; simpler.
Spawn through state diffs
Spawned actors as state diff entries; rollback handles via standard replication.
“State and events are different network concepts. Rollback handles state; events need extra.”
If you implement rollback, design event handling deliberately. The spawn class is the common gap.