Attempting to Package my Project in ArcGIS Pro 2.9, i'm blocked by a long list of "High" errors claiming that the sources for Layers i've deleted are inaccessible (error #00003). Esri advises, "Hover over the analyzer message. Click the Options button that appears and click Remove Items With Errors", but "Remove Items With Errors" is not offered. What is offered is "Select Layer In The Contents Pane" which proceeds to reload the item that was long ago deleted.
Months after deleting these layers, the Project has been saved, closed, and reopened; the cache has been cleared (Project > Options > Display > Clear cache - checked, project resaved, closed, and reopened), and i have excluded Toolboxes and History Items, and i've unchecked "Share outside of organization". There are no other Jobs, and the package has no Attachments.

Any help...?