Thanks for the comprehensive response!
Sounds like the reservation system that you currently have really isn't doing you any favours right now. Is there not even a way to prepend the emails with some text that concisely articulate what you've stated - and effectively "TL; DR - the 'confirmed' bit is right, we can't do much about the rest just now but we're working on it!" (work on the tone, of course, but you get the idea
)
I suspect this is related, but when I try to log in to manage my booking (need to add passport details for one of our party), I can't even seem to do that now because of the schedule change...
...but I think in another thread, someone mentioned that the mobile app has better functionality than your website? Maybe I should give that a try.