Since 184.108.40.206 you can switch from the account you're logged in with to the very same account.
Steps to reproduce:
- Log in with an account that has no Sub-Accounts but is in a Clan
- Click your name in the top bar
- Click your name without the Clan-Tag in the dropdown menu
- The game asks you if you want to switch accounts
- Click OK to log out and log in to the very same account
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Look for my highlighted text (important information) and grey text (interesting but not required information).
Tidied up this a bit, however, you will still be able to (re)log in to the same account as this behavior is intended.
Thanks to Elkano for his help with this.