The first example in subject section, which was to demonstrate the
behavior of a GrandStaff not accepting a contained StaffGroup, appears
to have been broken by merge request:
https://gitlab.com/lilypond/lilypond/-/merge_requests/730 "Derive all
StaffGroup-like contexts from StaffGroup"
In current development version, both examples in this NR section produce
the same graphic display.
John
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