In this case, you misrepresented the work experience field (it doesn't matter by mistake or not) false information is considered misrepresentation, period. Consequently, you could be banned not only from OINP but also Express Entry application. I advise you to fix your mistake and update all your details truly and with honesty, and just wait for a new invitation either from EE or OINP.
Don't accept Ontario nomination because you'll be wasting $ 1,500 as well as risking banning from future PR application.
Just be honest and careful, and wait for next round.