Young Tomato Plant Stem Issue

[EFGrows]

Started indoors last month....Batch of about 8(of 12) made it to this point...During "hardening off", three of them recently showed signs of "bare sections" on their lower stems...However, they all look "healthy" on top as far as the leaves are concerned.....Is this "normal" or something that needs to be addressed?

 

[Oliver Buckle]

It looks as though the one on the left has lost its seed leaves, I can see one in the pot. No real problem, when you repot them bury them right up to the first 'real' leaves. They will make roots all the way up, some people say that those top roots only act as support, I can't see it myself, a root is a root, and anyway even if they do there is nothing wrong with a bit of extra support.