It looks like sun damage to me. The same thing happened to my tomato seedlings the other day. I didn't expect the sun to be so hot this time of year. The new leaves will be ok.
I did the same put them out all day didn’t realise how hot it was so then gave them lots of water so wasn’t sure which one it was too much sun or too much water and they were doing so well for my first attempt
Probably a combination of both! If the leaves got overheated and then the plant was then trying to take up too much water, the poor things have got a bit stressed. Don’t water again for a couple of days and then keep the soil just damp to give then a bit of recovery time and the new growth will be fine. Gradually increase the watering but never so they are sitting in it.
I forgot to open the ventilation two days ago in my poly tunnel and lots of things keeled over on the heat, but they are perking up again.
Mountainous Northern Catalunya, Spain. Hot summers, cold winters.
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The new leaves will be ok.
I forgot to open the ventilation two days ago in my poly tunnel and lots of things keeled over on the heat, but they are perking up again.