This is old trick but still work
I'm not sure this bug or feature Requests
1. register with myemailaccount@gmail.com and I create account no 1
2. register with my.emaila.ccount@gmail.com and I create account no 2
3. register with myemailaccount@googlemail.com and I create account no 3
4. register with my.emailaccount+email@gmail.com and I create account no 4
I can create more than 1 acoount with myemailaccount@gmail.com and you can use myemailaccount@googlemail.com, all email goes to 1 acoount myemailaccount@gmail.com
Those are all considered different emails.