Program: 11588
Project: 11588
Buggy source:
@Nonnull @ReturnsMutableCopy public List<CSSDeclaration> getSplitIntoPieces(@Nonnull final CSSDeclaration aDeclaration){
  ValueEnforcer.notNull(aDeclaration,"String_Node_Str");
  if (!aDeclaration.getProperty().equals(m_eProperty.getName()))   throw new IllegalArgumentException("String_Node_Str" + aDeclaration.getProperty() + "String_Node_Str"+ m_eProperty.getName()+ "String_Node_Str");
  final int nSubProperties=m_aSubProperties.size();
  final List<CSSDeclaration> ret=new ArrayList<CSSDeclaration>();
  final List<ICSSExpressionMember> aExpressionMembers=aDeclaration.getExpression().getAllMembers();
  modifyExpressionMembers(aExpressionMembers);
  final int nExpressionMembers=aExpressionMembers.size();
  final CSSWriterSettings aCWS=new CSSWriterSettings(ECSSVersion.CSS30,false);
  final boolean[] aHandledSubProperties=new boolean[nSubProperties];
  for (int nExprMemberIndex=0; nExprMemberIndex < nExpressionMembers; ++nExprMemberIndex) {
    final ICSSExpressionMember aMember=aExpressionMembers.get(nExprMemberIndex);
    for (int nSubPropIndex=0; nSubPropIndex < nSubProperties; ++nSubPropIndex)     if (!aHandledSubProperties[nSubPropIndex]) {
      final CSSPropertyWithDefaultValue aSubProp=m_aSubProperties.get(nSubPropIndex);
      final ICSSProperty aProperty=aSubProp.getProperty();
      final int nMinArgs=aProperty.getMinimumArgumentCount();
      if (nExprMemberIndex + nMinArgs - 1 < nExpressionMembers) {
        final StringBuilder aSB=new StringBuilder();
        for (int k=0; k < nMinArgs; ++k) {
          final String sValue=aMember.getAsCSSString(aCWS,0);
          if (aSB.length() > 0)           aSB.append(' ');
          aSB.append(sValue);
        }
        if (aProperty.isValidValue(aSB.toString())) {
          final CSSExpression aExpr=new CSSExpression();
          for (int k=0; k < nMinArgs; ++k)           aExpr.addMember(aExpressionMembers.get(nExprMemberIndex + k));
          ret.add(new CSSDeclaration(aSubProp.getProperty().getPropertyName(),aExpr));
          nExprMemberIndex+=nMinArgs - 1;
          aHandledSubProperties[nSubPropIndex]=true;
          break;
        }
      }
    }
  }
  for (int nSubPropIndex=0; nSubPropIndex < nSubProperties; ++nSubPropIndex)   if (!aHandledSubProperties[nSubPropIndex]) {
    final CSSPropertyWithDefaultValue aSubProp=m_aSubProperties.get(nSubPropIndex);
    final CSSExpression aExpr=new CSSExpression();
    aExpr.addMember(new CSSExpressionMemberTermSimple(aSubProp.getDefaultValue()));
    ret.add(new CSSDeclaration(aSubProp.getProperty().getPropertyName(),aExpr));
  }
  return ret;
}

Fixed version (ground truth):
@Nonnull @ReturnsMutableCopy public List<CSSDeclaration> getSplitIntoPieces(@Nonnull final CSSDeclaration aDeclaration){
  ValueEnforcer.notNull(aDeclaration,"String_Node_Str");
  if (!aDeclaration.getProperty().equals(m_eProperty.getName()))   throw new IllegalArgumentException("String_Node_Str" + aDeclaration.getProperty() + "String_Node_Str"+ m_eProperty.getName()+ "String_Node_Str");
  final int nSubProperties=m_aSubProperties.size();
  final List<CSSDeclaration> ret=new ArrayList<>();
  final List<ICSSExpressionMember> aExpressionMembers=aDeclaration.getExpression().getAllMembers();
  modifyExpressionMembers(aExpressionMembers);
  final int nExpressionMembers=aExpressionMembers.size();
  final CSSWriterSettings aCWS=new CSSWriterSettings(ECSSVersion.CSS30,false);
  final boolean[] aHandledSubProperties=new boolean[nSubProperties];
  for (int nExprMemberIndex=0; nExprMemberIndex < nExpressionMembers; ++nExprMemberIndex) {
    final ICSSExpressionMember aMember=aExpressionMembers.get(nExprMemberIndex);
    for (int nSubPropIndex=0; nSubPropIndex < nSubProperties; ++nSubPropIndex)     if (!aHandledSubProperties[nSubPropIndex]) {
      final CSSPropertyWithDefaultValue aSubProp=m_aSubProperties.get(nSubPropIndex);
      final ICSSProperty aProperty=aSubProp.getProperty();
      final int nMinArgs=aProperty.getMinimumArgumentCount();
      if (nExprMemberIndex + nMinArgs - 1 < nExpressionMembers) {
        final StringBuilder aSB=new StringBuilder();
        for (int k=0; k < nMinArgs; ++k) {
          final String sValue=aMember.getAsCSSString(aCWS,0);
          if (aSB.length() > 0)           aSB.append(' ');
          aSB.append(sValue);
        }
        if (aProperty.isValidValue(aSB.toString())) {
          final CSSExpression aExpr=new CSSExpression();
          for (int k=0; k < nMinArgs; ++k)           aExpr.addMember(aExpressionMembers.get(nExprMemberIndex + k));
          ret.add(new CSSDeclaration(aSubProp.getProperty().getPropertyName(),aExpr));
          nExprMemberIndex+=nMinArgs - 1;
          aHandledSubProperties[nSubPropIndex]=true;
          break;
        }
      }
    }
  }
  for (int nSubPropIndex=0; nSubPropIndex < nSubProperties; ++nSubPropIndex)   if (!aHandledSubProperties[nSubPropIndex]) {
    final CSSPropertyWithDefaultValue aSubProp=m_aSubProperties.get(nSubPropIndex);
    final CSSExpression aExpr=new CSSExpression();
    aExpr.addMember(new CSSExpressionMemberTermSimple(aSubProp.getDefaultValue()));
    ret.add(new CSSDeclaration(aSubProp.getProperty().getPropertyName(),aExpr));
  }
  return ret;
}