Wrong clef after condensing

When condensing staves I don’t get the desired clef for Viola / Tenor 1. I read that the clef of the first instrument in the condensing group is chosen. But if I place the tenor above the viola in the setup (and then correct the order in the ‘custom player order’ of my layout) nothing changes. Is there anything else I can try?

My feature suggestion would be that in the ‘custom condensing group’ one could pick a master-stave that decides upon things like clef…