I have the same problem in Workspace.
When using a prop or evar which is not present in every page (e.g. product name) and therefore has unspecified values,
I can filter out the unspecified in the table format (and the grand total adjusts)

BUT
when I create a line chart the unspecified values are not filtered out and although I am supposed to see 0 for some days I see the total number of visits/pageviews including the unspecified values
Is there any way to filter out unspecified in the charts as well ?