Page table field sort order change not saved

[MarkE]

I think this is a bug rather than anything specific with my set-up, but it would be nice to know if anyone else has this problem.

If I have a page table field in a page which is itself in a page table field and I edit the (intermediate) page containing it (in a modal), but the only change I make is the sort order of the page table items, then the save button has no effect - I need to change something else (and change it back) in order for the save to be effective.