Q.Poppies Mistaken For Dandelions, Will They Survive?
While pulling dandelions, someone mistook my bed of poppies for dandelions. This just happened, in late April, before the plants had any buds or flowers, but had a healthy crop of leaves coming up. There were about 4 pounds of leaves and about an inch at the root from below the dirt. I planted the little bit of the root at the end of the leaves of the 20 or 30 plants that were pulled. What else can I do? Any fertilizer or feed that could help them? I honestly don’t expect them to survive. The poppies have been there for 40 years, but every plant was severed an inch below the leaves. Will the deep roots survive? Will I lose my poppies?

Certified GKH Gardening Expert
Even if they don't regrow this year, I'll bet they will come back next year. They have a long taproot that restores itself. I would just care for them as you usually do.
https://www.gardeningknowhow.com/ornamental/flowers/poppy/growing-poppy-flowers.htm