Cannot declare EntityManager & other lazy loaded classes

### Symfony version(s) affected

5.4.0

### Description

![Screen Shot 2021-11-15 at 4 10 48 PM](https://user-images.githubusercontent.com/62905218/142075615-291f78eb-c4ac-4e77-9884-3c852f3992e4.png)


### How to reproduce

Rebuild schema or perform any API call.

### Possible Solution

_No response_

### Additional Context

_No response_