Minipage content overlaps with text before that if nccmath is used

It seems that if the nccmath package is included, then the text in the following minipage overlaps with the text before that if the minipage contains only display math. The FixMinipageForNccmath macros is from nccmath affecting minipage widths.

documentclass[fleqn,preview=false]{standalone}%
%
usepackage{amsmath}%
usepackage{nccmath}% Needed for fleqn environment

newcommand*{FixMinipageForNccmath}{hrule height 0pt width hsize}%

begin{document}
Some text: $2 ln x = 1$

begin{minipage}{0.70linewidth}FixMinipageForNccmath
begin{align*}
       ln x &= frac{1}{2}
end{align*}
end{minipage}
begin{minipage}{0.30linewidth}FixMinipageForNccmath
    Note: abcd
end{minipage}
end{document}