SLUR_SEGMENT pagePos returns wrong number

I just noticed (this may be a MuseScore 4.5.1 thing) that when I get an element of type Element.SLUR_SEGMENT, the value for pagePos.x is always 10.34482441... (etc) no matter where it is positioned on the page. pagePos.y is returning some different numbers, but they seem quite similar to each other (i.e. from a small number of possible values).

I wonder if it's actually returning the coordinates of the system it's attached to instead?