I don't know if this is old news but it seems that the dynamics texts clash with the stems of cross-staff knee beams:
\version "2.12.3" \new GrandStaff << \new Staff = "PnRH" { \clef "F_8" \relative g,, { \override Beam #'auto-knee-gap = #1 gis8 \fff \change Staff = "PnLH" a, \fff \change Staff = "PnRH" r4 } } \new Staff = "PnLH" { \clef "F_8" { s4 r4 } } >> got an arrow on the knee...
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