In general you will find that things work differently depending on whether you export from Sibelius using the built-in MusicXML export feature added in Sibelius 7, or the free Dolet plug-in (which can also work with earlier versions of Sibelius). Each has different strengths and weaknesses. If you have specific issues, please give us the details and we’ll see what we can do to help.
I’ve been using the MXML exporting using Sibelius 20.9.
I think the only ‘oddity’s’ occur when I export a Sibelius document that might have been started in an older version of Sibelius, and perhaps one in which I had some strange things happening when using Sibelius itself.
Bringing in a Sibelius score from earlier this year is actually pretty smooth. The only things missing might be some staff and system text markings. That’s about it.
Re-editing in Dorico and formatting parts in Dorico makes things go pretty quickly.
But, will mention any re-occurring ‘oddities’ if anything striking comes up again and again. Thanks!
**(…of more importance, I’m going to post a new topic right now on “Pitch-before-Duration and Dotted notes’ with Tied notes”