1. Sender - sends email to kumar.s@gmail.com but email received by me and my email id id k.s.kumar@gmail.com
(note : given example email id)
2. Mostly bank related emails received by me but it has sent to other
For more Info :
https://issuetracker.google.com/issues/189965376
To investigate further will provide more info once team reach me , i will support investigate team and like to report bug and secure