Issue/Bug 1.20.1:
When attempting to add new players to our whitelists, the result is always "That player does not exist". This issue did not exist a month ago when we updated our whitelists.

Expected Behavior:
Issuing the command /whitelist add [player name] should add that player if the account exists.

To Reproduce:
Start a 1.20.1 server and issue the command /whitelist add _jeb (or any valid account you know exists)

Note:
This does not happen in version 1.20.4.  We are still running 1.20.1 servers and should not have to update to 1.20.4 just to get whitelisting working.

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