BufRead not reexecuted when returning to a buffer?

I have these commands in my ~/.vim/filetypes.vim file:

function DetectFind()
let myfn = "/home/cts/nodes/vim/".expand ("%:t").".vim"
execute "source ".myfn
endfunction


au BufNewFile,BufRead /home/cts/nodes/f0/test/find/* call DetectFind()


And it works fine when I start up vim - if there's a vim file with the same root as the file I'm editing, it'll colorize it.

The problem is, if I switch buffers and come back, it doesn't colorize - I suspect that DetectFind() isn't being invoked again.

I've looked at all kinds of things, did_filetype, my own did_* flags, clearing autocmds, verbose mode, etc. etc.

Any help will be appreciated

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