In wp 5.5.1 doesn´t send the email

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Suddenly in the last update to Wordpres 5.5.1 the plugin stop to send the personalized welcome email from a user registered from the front page.. If I register a new user from the wp-admin, the mail sends ok

the email to reset the password from the front end function as spected, only the custom registration email don´t send to users registered from the front pae..