Failed Tesla coding assessment

Hi folks, I recently got a C firmware assessment to complete recently from Tesla Energy. 5 questions with simple concepts: macro, debugging, state machine, etc. I finished the thing in exactly 60 minutes and passed all test cases without any help, with as much comments I could put. I felt really confident this opportunity would turn for the better, but I got a reject the next day. What am I doing wrong ? What #hardware #interview #semiconductor