✅ Missing reference for one entity but not for another

I have two entities: Cat, Dog in Database.Entities project. If I reference this project via

using Database.Entities

using Database.Entities

I can type

new Cat()

new Cat()

and use it but I can't type new Dog() and it gives error that missing reference and I have to use

new Database.Entities.Dog()

new Database.Entities.Dog()

What in the world is going on? Thank you!

✅ Missing reference for one entity but not for another - C#