Yii2 and Nested Sets - is not supported for inserting new nodes?

Question

Yii

An error occurs when creating a new category through the CRUD form, where to dig

Answer 1

The error occurs because the NestedSetsBehavior behavior does not allow inserting an entity (in this category example) without first calling a modifier method from that behavior (For example: makeRoot() or prependTo()). Without this, it is not clear what place in the tree structure the new category will occupy.