There are 2 obvious causes of this: one is the slight clef change; the other is a slight spacing change - it looks like, as a general rule, 2.15.9 is slightly more compact on ragged-right versus 2.15.7 (which is my local baseline).
I'll attach one difference file which I don't understand - is this the effect of the change in spacing to the time sig?
Not sure how we can take this forward? In principle I guess we could temporarily revert the clef change and try to find what caused the spacing change, and then do a specific release with just those. Or we could take shifts in checking images. Or we could keep our fingers crossed.
-- Phil Holmes
<<attachment: accidental-broken-tie-spacing.png>>
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