I’m working on a Dorico project with four trombones. On the beginning of a flow, I have trombone 1 and 2 condensed to the same staff, and 3 and 4 to the second. I want to have a sub-bracket drawn around both staves, but Dorico won’t let me. Having 1, 2 and 3 on the same and 4 alone works with the sub-bracket for some reason, but as soon as I have them in the configuration I want them to be in the sub-bracket disappears. Is there any workaround to this?