If I write \new Staff { \time 2/4 << \tuplet 3/2 { c''4 d'' c'' } \\ \tuplet 3/2 { g'4 a'2 } >> }
the results look awful:
Shouldn't both tuplet brackets span every notecolumn within the purview of the last note's duration? I think this might also apply if the upper voice contained 4 eighths instead of the three triplets:
-- David Kastrup