Yes you’re right, it does revert back when you close and reopen after toggling the property.
How’s this one @stefanorabaglia - I deleted the system break on the final system of the part, and deactivated the “Wait for next…” on the preceding system break in bar 636. Not sure why that would have such a profound influence on the grace note, but I’ll certainly ask the team.
sample_lh2.dorico (840.2 KB)
Edit: my learned colleague Richard says that the “Ends voice” property set on a rest in b199 is the real underlying cause - if you deactivate that, save, close, and re-open, the grace notes at the end should be fine. However, that will affect the notation in b199 so you’ll have to make a judgement about that. (Edit 2: you could instead use a tuplet to fill that bar with only the rests you want, and input them with force duration if needed, rather than remove rests at the end of the bar.)
(Also, be careful using the Global property scope when moving system objects graphically - it can affect the position of the corresponding item but only in the top-most staff of the system; the tempo marking in b203 is offset into the staff in the Flute part.)