Auto-sell and auto-buy act as soon as a production run finishes
When a production run finishes, the building's auto-sell and auto-buy rules now run straight away instead of waiting for the next world update, so new output is offered sooner and the next run's inputs are reordered sooner.
Auto-sell and auto-buy rules used to act only on the world update, so finished goods could sit in the building, and an input the next run had just used could go unordered until the next update came round.
Now the building's rules check its stock as soon as a production run finishes: Auto-sell offers the new output, and Auto-buy tops up whatever the next run just used.
The rules still work exactly as you set them up. A rule waits until its minimum batch is reached, keeps its price and freight limits, and pauses or suspends for the same reasons as before, so a finished run does not always mean an order. The regular check on every world update carries on as well.