Liriodendron Tulipifera seed sprouts

Has anyone germinated Liriodendron Tulipifera (American Tulip Tree) seeds?

I ordered them from Austria and cold stratified them by storing in fridge for 70 days in seed starting trays.

Then I put it outside, after a week one sprout I got for about 1 inch long and I moved that tray separately. It hasnt grown true leaves yet, only the cotyledons.

In the other trays I see very tiny seedlings at the place where I planted the seeds. Are Tulip tree seedlings that small or I am getting sprouts from other seeds (I haven't planted any other seeds along with them but may be some minute seeds got there by air)

Then I did a search and found this the structure of the tulip tree seed and its size. Seems like the seed size is small inside the seed coat - little bit bigger than the size of a mustard seed.

My question is, are Liriodendron Tulipifera seedlings tiny and small when they sprot out. Of course I can wait and see but I am curious to get information ...

they are pretty small. i’ve never intentionally germinated tulip tree seeds (they’re one of the dominant trees in our forests here and they’re everywhere)