I noticed when bulk creating users on my moodle system with a csv file that I was getting a list of warnings with the following message.

Invalid data detected for user s1 and it has been automatically cleaned.

I had a talk with Simey as I was curious as to why I was getting this notice.
His comment:

the validation is passing but it should check if the validation result is true (passed)

Apparently my data is not invalid.
Attaching my csv file for testing.