Bassed in E flat and B flat missing

I have noticed that both Bass in E flat and Bass in B flat, tenor and bass clef, are missing in the Brass instruments list. Is this overlooked, or is this because of the new instrument list feature? In case of the latter, I don’t see how this made the job easier…

Bass clef transposed do exist. They are not Tubas but Basses. Maybe that why you haven’t found them?

I’m sorry for this problem: there is an issue in Dorico 5.0.10 where some de-duplication of instruments with identical names has ended up removing instruments from a different family. This will be corrected in the next update.