Only an order will trigger an inventory sync from the Destination Store to the Source Store.

A manual adjustment will not trigger an inventory sync from Destination Store to the Source Store to prevent any accidental inventory updates to master inventory in the Source Store.

Since we use the source store's inventory as the source of truth for inventory, if the source store updates the inventory, this update would trigger inventory sync from the source store to the destination store. The destination store product's inventory would be set equal to the inventory at the source store.