noflagu3 - warning in Lilypond 3.13.14

[Jiri Zurek (Prague)]

When I use the Stem #'flag-style = #'noflag in conjunction with \melisma I
get an error while processing which says:
warning: flag `noflagu3' not found

It does produce the PDF but I still wish to know if there is something I can
do to get rid of this unpleasant and potentially dangerous (for the final
PDF output) warning, or if it some kind of a bug in Lilypond.

\version "2.13.14"
\score { 
    \new Voice = "cantus" { 
    \override Stem #'flag-style = #'noflag 
    c'8    \melisma d'4    \melismaEnd  
    } 
 }
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