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deadbeef-f00d-f00d-deadbeef isn't a valid UUID v4

Aside from missing a grouping in the middle, you need the version and variant bits, ie:

XXXXXXXX-XXXX-4XXX-VXXX-XXXXXXXXXXXX

where V is 8, 9, A, or B

searching for deadbeef-f00d-400d-a00d-deadbeef does return the expected matches

Your comment is needed as a parent / top-level for the discussion. A lot of people were confused about the 'V' portion in particular. Thanks for the insight.

I don't think f is a valid UUID version. One of these positions should be 1–6 or so (not sure who's the authority on which version works how, IETF maybe?)

That’s not a valid UUID? The version and variant parts are missing.