<score>
\layout { indent = 0 } \new Score { \new Staff { \relative c, { \time 4/4 \key d \major \clef "bass_8" \omit Staff.ClefModifier \tempo 2 = 60 \omit Score.MetronomeMark \bar "" fis2\p( g4 a) | a4( g fis e) | d2( e4 fis) | fis4.( e8) e2 } } }</score>

Without the line break after <score>, the entire score is duplicated; replicated on wikidata.beta.wmflabs.org (see T218191#5020310).

Wikibase does not allow line breaks in strings. This may be problematic in some cases, since the design of the interface would encourage users to add \layout or similar code for cosmetic rather than functional reasons. It might be possible to resolve this by adding a line break in the template used for generating scores.