That is tough, I had a few lighting mishaps too. Had the lights come on in the middle of dark for 3 hours once and there was another minor problem I don't remember exactly now too.
Generally, what I have read and when I posted a question about it the responses were to just go back to the regular light schedule. Most people though everything should be fine, they were right I had no major hermie problems (just the Purple Kush at the very end due to genetics IMO).
I don't think you will get a mold problem from it but if it were me I would worry about the hermie possibility. Try to get them back to the schedule you want them at/that they were on over 2-3 days would be what I would do. Make sure they get at least 10 or 11 hours of dark as you slowly switch them back.
On the first adjustment I would have the lights out until 10:30pm tonight, then on until 9:30am tomorrow, back on at 8:30pm, off at 7:30am, then on at 7pm...
My thought process is that bringing them back gradually is better than more confusing lighting for them. I know people who flower on 13/11 so you should be ok using slightly less than 12 hours of dark.
I know people will have opinions all over the map on this question. Some will probably tell you to just switch back to 7am 7pm and not sweat it.
Maybe post a question about it and see if you get responses from someone who has delt with it and seen the results.
Take my opinion with a grain of salt, it is just what I would do intuitively. Changes are more gradual in nature so I would try as best I could to replicate that.
If your genetics are strong and not prone to hermie I don't think you will see any problem though.