\tabChordRepeats does this earlier in order to escape the scorification
defaults unsuitable for tabulature.
\tabChordRepetition will instead change the scorification defaults but
those are then applied to any music, not just that in TabStaff.
My personal opinion is that either should just be abolished and instead
the string assignment function determine-frets in
scm/translation-functions.scm should record any string/fret assignments
it makes and reuse them for the next chord unless incompatible with
explicit fingerings.
It's not like it makes sense for manually repeated chords to have the
fingerings forgotten.