melismas on tied notes not left-aligned

[Kieren MacMillan]

Hello, all --

Just noticed that melismas on tied notes are centered on notehead,  
whereas melismas on slurred notes are left-aligned (as expected)
I double-checked and they were both left-aligned in v2.8!

While we're here...  ;-)
Is there an easy way to (globally) set the X-alignment of (just) the  
first syllable of a melisma?

Thanks!
Kieren.

%%% BEGIN SNIPPET %%%

\version "2.9.17"

theMusic = \relative c'
{
        c4 c ~ c8 c4 c8
        c( d e d) c2
}

theWords = \lyricmode
{
        Some word, __ then a long __ word.
}

\score
{
        \new GrandStaff
        <<
                \new Staff << \theMusic >>
                \addlyrics { \theWords }
        >>
}

%%% END SNIPPET %%%