Empty entity attributes

Faced a problem, I can not get data from the entity. For example,

Code:

$user_entity->username

always returns NULL. When viewing the entity obtained through Kint debug, my data is visible in the attributes. Also, when using getters or setters of an entity, I constantly get an error

Call to a member function test_func () on array

An entity object is returned by the model. I did everything according to the CI4 documentation, but ran into such a problem. What are the options?