The undef value is subtly different from using an undefined variable, so that may be causing the problem.
tst($foo{undef}); # doesn't warn from tst
This uses the undef value as a key into the %foo hash; the key presumably doesn't exist so Perl returns undef. This is working as I would expect.
tst($foo{$undef}); # warns from tst
This looks up the value of $undef, which presumably isn't defined, so Perl should flag an error at that statement, not inside tst. If that is the case, then it, too, is working as I would expect.
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