Tied notes interfere with correct placement of lyric

[Richard Opheim]

\version "2.12.3"
{%{Measure 1 %} e8 g8 f8 a8 ~ 
%{Measure 2 %} <a8 c8> d4 
}
\addlyrics {A B C D } %first part
\addlyrics {\skip4\skip4\skip4\skip4 E F } %second part
 
In the example above, lyric E in the second part is supposed to line up 
vertically with note c8. However, when the a8 of measure 1 ties with the a8 of 
measure 2, E seems not to recognize c8 (though it would if it weren't for the 
tie in the other part) and slides over to d4.
 
How can I get lyric E to align with c8?
 
bonus question:
If I put an extender on lyric D, how can I keep it from extending past a8 in 
the 2nd measure?
 

Richard Opheim