Multimeasure rests destroy slurs
Load file Test_multirest.mscx. You see
Activate multimeasure rests. Save and close the file. Load the file again. What you see is
Not only one slur is missing, but the score is corrupted, as you can see when saving again and looking into the file: The tag of the second slur is missing, but it's start tag and stop tag are yet there. In cease of greater scores you get some trouble.
Conclusion: Saving scores with multimeasure rests is not recommended.