Some images to confirm, Bravura:

Leland:

Finale Maestro:

But that seems by design, seems Maestro Text (!) doesn't have that glyph, so falls back to Leland Text:

        fontProvider->insertSubstitution(u"Finale Maestro Text", u"Leland Text");

That in turn would fall back to Bravura Text for missing glyphs, but doesn't need to here.

For the Musical Fonts though (those without "Text" in the name) the fallback is always Bravura, apparently.
Seems inconsistent to me, but is a different issue.

Check yourself: change only the text font and see the "Ped" changing

Strangly for Pedal lines the Musical Text Font is used, but for Ottavas the Musical Font is used, that seems pretty inconsistent, doesn't it?
Mu3 used the Musical Text fonts for both, so this seems to be a regression

That would explain why 8va works in Mu4 but not Mu3, do you think it's fair to mark this as a regression? After all, the Mu4 result is slightly better in this case.

For Ped it looks worse, doesn't it? And that's what this issue is about ;-)
It may not a regression, but is inconsistent.

The task/fix here is to change pedal lines to use the Musical Symbols Font, not the Musical Text Font (just as with ottavas).