Dear Dorico team,
When using large time signatures in scores where empty staves are hidden, at the end of a system where the subset of shown instrument is different in the following system, the “largeness” of the cautionary time signatures is cancelled and small ones appear instead (see picture). This seems illogical and I assume this is something you intend to fix provided you know about it.
All the best!
Dorico works this way because it is using the information about the staves that will appear at the start of the following system to determine how to draw the cautionary time signatures at the end of the previous system. Changing this will be quite tricky, but I’ll make sure it is added to our backlog for future consideration.
I suspected that was the case. Anyway, thanks for taking it into consideration! 
