Issue retrieving a Computer property in Custom report

I encountered an interesting issue while modifying a custom patch report today.

When I added a property derived from an analysis to the report (All the other properties in this report are global or reserved).

Case 1: When I applied a Web Reports filter that combined Computer and Content attributes (or any other domain), the values reported for this property were empty.

Case 2: When I removed the Content portion of the filter, leaving only the Computer attribute filters, the actual, non-empty value was returned (of course the resulting report returned many more rows than I wanted)

Case 3: As a test, I used QNA to inspect the property’s values, and the actual values were returned.

Case 4: When I moved the filtering of Content from the Filter into the Session relevance as part of the content whose-it filter, the actual values were returned.

Is Web Reports Filtering intended to behave this way, so that properties derived from analysis become invisible to Session Relevance when joining filters from multiple domains?