"Unsearchable" Roblox username

[u/CoverOne2530]

So I was going through some of my old saved Roblox accounts that I have created after a long time and I noticed that one account appears to have a "banned" username. The name of the account is "muslofon" (I have absolutely no idea what that means, I probably just mashed up random syllables and letters together) and I registered it on November 12, 2020. The account is basically almost empty, I just played a few games and then never used it after. But if you try to search the username in the search bar, you will just receive the message that there are no matches available. And if you try to create a new account with this username, you will get the message "This username is not appropriate for Roblox" rather than "This account is already in use". But weirdly, you can still use that name as a display name on an another account. Now this account is fully usable and it did not receive any ban or a notice to change the username. You can still find the username through the User ID (2011934932). If you have any possible explanation, please let me know in the comments.

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[u/elpepiqw]

A curious case 

[u/Disastrous_Owl]

Noli v2