Harmonics and quoted music

[Shevek]

I just noticed that the following code works fine on 2.19, but crashes on
2.18 without an error message:

\addQuote "test" { <c'\harmonic g>2 }

\new Staff {
  \quoteDuring #"test" {
    s2
  }
}

I don't see anything about this in the 2.20 changes documentation. What's
going on here?



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