flowering too early

Maybe some plants do some not..a haze will do sure....banana og not...as example from my knowle..

If you used autoflower seeds you can't put it back to veg. stage. If you used feminised seeds and the light cyrcle changed, you can't put it back to veg. stage, without changing the light cycle too. (18/6 for veg and 12/12 for flower - recommended)

If you are growing autos, no. If you are growing photoperiod plants, yes, they will most likely revert to veg and go back to flowering in August.

No, since it changes the photoperiod. It will continue flowering until the end. They still look very pretty.

You'll get a re-vege and hopefully that stops before it goes back into flower near end of july. A long dark cycle causes a hormonal feedback loop to set the plant into flower phase. Then as the days got longer and nights shorter, the plant now has started to shift back into vege phase. It's going to be a mess of axillary growth and funky looking leaves for several weeks i bet. Too much axial growth. you'll do best to thin some of it out on a regular basis so you don't end up with a molded over mess of foliage.

left outside yes they'll likely reveg unless they're autos lol. The solstice isn't until like June 20th so daylight hours are still increasing, at leastin the northern hemisphere.

Nope, once flowering they will not reveg again unless they receive again 18-6 now. Outdoor the plants follow the light cycle naturally