You can clone with
HTTPS or Subversion.
I found the issue first when using unicode-math, see wspr/unicode-math#246
Later I tried the git version of lualatex-math, all problem solved.
So will it be a good idea to update the package in texlive as well?
I've just pushed the fixed version to the CTAN upload, it should appear on CTAN and in TeX Live within a few days.