Always annoying!
A band of which I'm presumably still a member (though no rehearsals have been organised recently) was afflicted by misuse of rehearsal time. I'd always ask for example recordings and charts well in advance, but sometimes receive them late in the evening the day before. Similarly, requests for a set list for the next rehearsal would be answered, but when I turned up prepared there was a good chance of encountering "oh, I thought we'd try a new one, here are the charts and let's have a listen to a recording."
There's one other band I play with where the first time I encounter new tunes is most likely on the bandstand during a gig, but the material is so simple that this is not a problem. The material for the band mentioned above is more complex, with various parts for horns and specific arrangements.