What steps will reproduce the problem?

Call the method with 3 different uuid's as param.

What is the expected output?

An array with the 3 different users.

What do you see instead?

An array with 3 elements, but each element contains the same user.

What version of the product are you using?

The current one.

Please provide any additional information below.

In services/users/users.php, correct the following line:
$results[$row['uuid']] = &$entry;

Corrent one should be:
$results[$row['uuid']] = $entry;