We did make a change in release 400, related to agile slots.
Basically, when the auto pre-selection runs, it checks whether any slots are already selected in the future for the remainder of today or tomorrow.
If that is the case, we do not prepopulate, because this means you have already pre-selected other slots. Perhaps this logic will need to change and check if these other slots are selected within the Agile Charge window and if none are, then add them.
Can you confirm this was the case?
Workaround for now would be to go into your Agile Charge window settings and Save without making any changes.