I had this same problem. I solved it by making my image column not required.
I have a list with 12 columns and one is a Photo/ thumbnail. I am not trying to retrieve the photo into my approval flow, however it completely blocks all dynamic content, even when limiting return data to a view without the photo column. I tested this by replicating this list and deleting the photo column, at which point dynamic content becomes available again. Is this a bug?
Image columns in SharePoint are not returned in the output of the Get Items action in Power Automate. You can get the Image URL using SharePoint REST API:
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