\repeat volta 2 + two blocks in \alternative = More alternatives than repeats?

[Kevin Cole]

I have a section for chords and a section for melody. Each has
"\repeat volta 2" and two blocks in an "\alternative". I've reduced to
what I think is a pretty minimum MWE, and still get:

|    $ lilypond mwe.ly
|    GNU LilyPond 2.22.1
|    Processing `mwe.ly'
|    Parsing...
|    warning: More alternatives than repeats.  Junking excess alternatives
|    Interpreting music...
|    Preprocessing graphical objects...
|    Interpreting music...
|    MIDI output to `mwe.midi'...
|    Finding the ideal number of pages...
|    Fitting music on 1 page...
|    Drawing systems...
|    Converting to `mwe.pdf'...
|    Success: compilation successfully completed

See attached:

mwe.pdf
Description: Adobe PDF document

mwe.ly
Description: Text Data