... As soon you have more keys a different key is the first returned.

don't think so (tried it with quite a number of keys — for each set of keys, the pseudorandom order obtained is replicably the same)...  But demerphq seems to have the explanation (in the thread already referenced above).

In reply to Re^2: Deterministic or keys in random order by almut
in thread Deterministic or keys in random order by andreas1234567

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