Thanks for the help. It must just be getting overloaded with too many handles in the filter.
If I have 2 favorites out of the 30 cast members it shows that the timeline is empty.
If I add one more favorite it shows 20 tweets and 4 of them are from the original 2 favorites.
But if I create a separate list with just those 3 handles and then filter out the 3rd favorite the 4 tweets show as expected.
In both cases they are not mentioning each other, so I don’t think that is part of it.
For now I think I just can’t offer that option to filter.