vimgrep/quickfix ignores "au BufNewFile,BufRead,BufWinEnter *.vb ... syntax enable | color mine"

I am trying to get the following 1-line autocommand to work:

autocmd BufNewFile,BufRead,BufWinEnter *.vb setl ft=vb | syntax enable
| colorscheme mine

It seems to work when the buffer is new. But when I do a vimgrep and
get placed in the location of the first quickfix line item, everything
is monochrome until I issue ":syntax enable | colorscheme mine". Is
there another event that I should add to the au command?

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