California residents: Issues with my son claimed as dependent in Covered California for half a year while I lived abroad. Then he made money with internship and needs to file by himself

I have been out of the country for a little over 330 days so I didn’t take on health insurance coverage through Covered California this year but I did get coverage for my son because he was my dependent. At the end of June I canceled coverage for him because he went for an internship were he made enough money to have to file his own taxes and he became eligible for Medical. Now I want to file taxes as a single paying more taxes than if I filed as head of household but I am concerned there will be a conflict with the Covered California coverage my son got as my dependent in the first half of the year and I may have to pay back what was paid in advance for that coverage by the government, although my claiming him at the time was correct. My son will also be filing on his own. What is the correct way to proceed with the tax filing without having to incur in any issue. Thank you

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