Ending staff of cross-staff not report in status bar or by screen reader
From the about box on Mac OS:
Revision OS: macOS 10.16, Arch.: x86_64, MuseScore version (64-bit): 220.127.116.118020600, revision: 3224f34
I think there is a bug in MuseScore when slurs cross staves. The descriptor that gets read out by the screen reader only indicates that the the first measure of the slur is involved but the playback includes all of the measures if you listen closely enough. If a slur is only on one staff across one or more measures, the screen reader output is correct and so is the text on the status bar. I get the same behavior from NVDA on Windows and VoiceOver on Mac.
Note: VoiceOver output on the Mac was done by placing the mouse cursor over the status bar and wiggling it after every change in item to get VoiceOver to re-read the entire status bar text again after it changed.
The attached file is what I received from my piano teacher and tested with on both platforms.
Can't tell you much more than that as I am a blind music student.
Further testing on the Mac:
Doesn't appear to be 100% repeatable. After restarting MuseScore and navigating though the score with Option-Right-Arrow and Option-Left-Arrow, the correct slur description is being read out. Over time, incorrect audio and status bar text appears.
In summary, there are two different problems I have heard while walking backwards and forwards through all items on the music sheet:
1. The staff identifier is wrong when a slur starts on one staff and ends on another, it always says staff 1.
2. If a slur is covering several measures, sometimes it incorrectly says the first measure is the only measure involved in the slur.
I haven't encountered any strange behaviors from slurs that are contained within a single measure or slurs that start and end on the same staff.