I posted about this rather egregious bug more than two years ago when it was already ten years old. Any chance of some movement on it? Grace notes not spacing correctly in linked voiced parts effectively breaks linked parts, and nothing has changed for twelve years now.

https://makemusic.zendesk.com/hc/en-us/community/posts/115000349127-Grace-notes-in-linked-voiced-parts-should-behave-properly