Quick question…
I see that in the 2nd screenshot, bar #21 is the first bar of the page. Was it also the first bar of the page in your 1st screenshot?
Do you have time to try a little experiment?.. Try Forcing the previous grand staff (i.e. the last staff on the previous page) onto the next page, such that bar #21 is now on the 2nd grand staff of the new page. Are the grace notes now visible? (sometimes there can be a bit of strangeness when the notes actually belong (MIDI-wise) to the previous bar, and that previous bar is, itself, on the previous page.)
If that has worked, then I think your only "workaround , is to “cheat” (physically Move the grace notes so that they do belong to the start of bar #21).
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