You are overthinking. Relax. You did the right thing by correcting.I am afraid if they will take this something wrong or misrepresentation? Sometimes I feel like withdrawing and resubmitting the application again for the mess I did on a date. I am on PR and sometimes start overthinking after reading misrepresentation laws etc.
Your valuable suggestion is highly recommended.
While it's no guarantee, it doesn't sound like the initial information is 'material' in the sense that if they knew the information, that it would mean that they would have looked at the file differently - your specific employment history is not a critical element of whether you are eligible as a sponsor or not. (But I don't know the details of course)
And I think it is extremely rare for IRCC to pursue the misrepresentation aspect where the person involved has made an honest, good faith effort to correct the record (seemingly before IRCC is even aware of it).