gracenote producing wrong clef

[madhg]

In keyboard music, an appoggiatura for the first note in the treble staff
interferes with the clefs in the lower staff.  It makes the bass staff start
with a treble clef folllowed immediately by the correct bass clef.  

Removing the appogg  gets rid of the problem: lower staff starts with the
bass clef as it should.

Lilypond v. 2.11.20.   Bug? or my error?

Small example:

myupperstaff = {
        \clef treble
        \time 4/4
                
         \appoggiatura f'16   e4 
        } % end myupperstaff
    
mylowerstaff = {
        \clef bass
        
        r4 
} % end lowerstaff
    
\score{
        \new GrandStaff  
    <<
    \new Staff = trebleStaff \relative c' \myupperstaff 
    \new Staff = bassStaff \relative c \mylowerstaff
    >>
}

Same thing happens if I use PianoStaff instead of separate staves combined
into GrandStaff.
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