\partCombine with \quoteDuring

[Paul Scott]

Here is the first step in solving a more complex score with rest 
position concerns:

Why is the \quoteDuring note missing?
\version "2.21.2"

obNotes = \relative{ R1 c'1 }
\addQuote qob \obNotes

\score{
  \partCombine
  \relative{ r4 d''2. e1 }
  \relative{ r4 fis'2. \quoteDuring qob s1 }
}


TIA for any ideas,

Paul