gvim acts differently when invoked from mingw64 and ms-windows

I just built gvim (+tcl) with patch 1421 on mingw64.
I changed file syntax/vim.vim to highlight tcl embeded in vim script (line 621):
let g:vimsyn_embed= "lmpPrt"

When invoked directly from ms-windows, it acts just as expected;
but when invoked from mingw bash, it fails to highlight tcl as if vim.vim was unchanged.

So I did :syntax in both case and diffed the outputs. All differences are related to tcl.

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