Done. All the roots were at risk. I found the as they were sunk in the ground..The smallest seedlings, the ones that sprouted in the ground could possibly die. One is very bad looking, I found the seed still attached, and her sister has no root but a sort of gem so I potted them. The soil in the ground was really wet because of the rain... Now I have a free "bed" and I could try to amend it well before using it again for planting the seedlings (the ones that will survive).
I guess the soil as it is it's too difficult for such small plants.