Manage reservations and Pick screen not allowing manual edits to reservation

Since 22A and 22B are deployed we are noticing that users are not able to put in a lot number in the manage reservation and picks screen. This process is manual and users usually make sure to edit and put in the lot number they want to associate with an order. However, what we are seeing is that since this latest release , this option is not available when all inventory of an item is consumed totally.

This is causing major confusion whenever an item nears its onhand quantity. Can someone explain a way to overcome this error.