Birds planted this

Location: Midwest United States

I started a raspberry plant in this grow bag (so I could keep them away from my dogs until they got big enough) this past spring. I got sick and while I was in the hospital, the plant died.

Over the summer, I noticed birds landing in the grow bag and stealing mulch. They must have seeded this in here. PlantNet is saying Lamb's Quarters (58% accuracy). Just wanted confirmation.