When a unit dies during a chain resolution, does cleanup happen immediately and does deathknell trigger before the rest of the chain resolves?

Ruling: Cleanup happens every time an item on the chain resolves. If cleanup causes a deathknell trigger, that trigger is added as the most recent item on the chain.

Sequence:

• An item on the chain resolves
• Cleanup happens immediately
• If a unit died, its deathknell trigger is added to the chain as the most recent item
• The chain continues resolving with the deathknell now on top