Navigation Properties with Many-to-Many Relations

With a one-to-many relation, I can use navigation properties when creating a new entity.

Why EF is generating navigation column while there is no foreign key in the model and the database

There is no foreign key in the database (Oracle) and the model and yet EF generated sql contains navigation column.

EF Core (3) – Parent / Children relationship stored in same databse table

I have the folowing classes