The note in the horn stops sounding when the F in the trombone begins. The F in the Trombone stops after one bar too. I have no idea what the problem is and I have not been able to find anyone with a similar problem. The only two solution that has worked for me is to set a higher tempo or switch instruments to strings. It seems like there is a maximum length of the brass notes. But it should be possible to play a brass note for two bars in 70bpm. It’s not even that hard, and even if it would have been impossible I wouldn’t want Dorico telling me that.
Thanks in advance/