Hi @glandrum,
Could you share a screenshot of your flow?
According to your description, it seems that you would like to send an email with items that have expired per day.
I have made the following test and the issue you mentioned could not be reproduced, all the items could be got when the flow is triggered though I have changed the view of the list and added some new items into the list.
It is configured likes below. For testing, I triggered the flow with a manual button.
Please check the following screenshot for a reference.
Best regards,
Mabel