"grace-types.ly" the acciaccatura slur ties to the stem and not to the head. I note also that in 2.0 the 8ths notes were not beamed together. I dunno which one is ok.
\score { \notes \relative c'' { c4 \grace { d8 } c4 \appoggiatura { d8 } c \acciaccatura { d } c } } joseluis
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