Identity map, another object of class was already present for the same ID

### Bug Report

| Q | A
|-------------------------------------------- | ------
| Version | ^3.1
| Previous Version if the bug is a regression | ^2.8

Another doctrine packages:
```
"doctrine/doctrine-bundle": "^3.1",
"doctrine/doctrine-migrations-bundle": "^4.0",
"doctrine/orm": "^3.3",
```
```
"symfony": "7.4"
"php": "8.5.0"
```

Before update to 3.1 - works fine

#### Summary

```
Wallet

#[ORM\ManyToOne(targetEntity: Currency::class, inversedBy: 'wallets')]
#[ORM\JoinColumn(name: 'currency_id', referencedColumnName: 'id', nullable: false)]
private Currency $currency;
```

```
Currency

/**
* @var Collection
*/
#[ORM\OneToMany(targetEntity: Wallet::class, mappedBy: 'currency')]
private Collection $wallets;
```

Uses simple query to get all entities.
```
$this->createQueryBuilder('wallet');
```

#### Current behavior
When the cache does not exist, opening the page causes this error only for these relations in twig.
When use dump in controller - no error.

After the cache is created, everything works fine.

#### Expected behavior

no error

#### How to reproduce

not sure how reproduce and why this error show only for one entity relationship.

Start by reducing the Wallet/Currency mappings and the simple createQueryBuilder('wallet') query to a minimal reproduction. Compare the first page load with an empty cache against the controller dump and the later warm-cache behavior, focusing on Twig access to the relation. Done means the cold-cache page load no longer raises the identity-map error and the regression is covered by a reproducible case.

Written by the indexing model from the issue text.