You don't need to do this, especially with plants of that size, but soaking a plant's roots in water (without a lot of soil) for 1-3 days before planting in its new destination can reduce transplant shock (like if you dig up a plant from the garden or something).If the roots are healthy and strong, and have the things they need, transplant shock shouldn't be as much of a problem. I have not experimented with it, however. Phosphorus may also play a role in preventing transplant shock, since it, like potassium, helps to encourage root growth.Fertilizing a newly transplanted plant with nitrogen (unless it's balanced by sufficient potassium, and maybe phosphorus) is a really bad idea. Nitrogen is like the opposite of potassium and encourages transplant shock. Make sure your soil isn't high in nitrogen.Wait until the plants are larger and stronger before transplanting.Plants given potassium sulfate are much more resistant to transplant shock. 8-10 hours of sunlight is way more than enough to cause this for a transplanted tomato (but it may depend on what kind of sun it is and what kinds and ratios of light are coming in). Bright light can easily wither plants with newly disturbed roots (as well as cuttings being rooted in soil on the first few days). After that, give them as bright of light as you like. Don't put newly transplanted tomato plants in bright light for two days.Here are some things I have found that one can do to avoid transplant shock: The plant's growth will be delayed for a while if it survives. When you transplant seedlings, if the roots are damaged or disturbed, then light (particularly sunlight) can make them wilt and die. Anything that disturbs (or removes) the roots could cause this. As Ecnerwal said, it could be cutworms, too, though. That appears to be classic transplant shock. Disclaimer: This answer is mostly based off of my own experience.
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