Renamed property not being saved correctly in symfony – PHP

I am trying to update the properties of my entity. For example, in the TestEntity class:

class TestEntity
{
    #[ORMId]
    #[ORMGeneratedValue]
    #[ORMColumn]
    private ?int $id = null;

    #[ORMColumn(length: 255)]
    private ?string $testMe = null;

    public function getId(): ?int
    {
        return $this->id;
    }

    public function getTestMe(): ?string
    {
        return $this->testMe;
    }

    public function setTestMe(string $testMe): self
    {
        $this->testMe = $testMe;

        return $this;
    }
}

I made a mistake with the snake_case naming convention, and I want to rename the $testMe property to $test_me."

In the updated text, I made some corrections to the capitalization and punctuation, and rephrased some parts of the text for clarity.

"I renamed the $testMe property to $test_me everywhere in the TestEntity class:

class TestEntity
{
    #[ORMId]
    #[ORMGeneratedValue]
    #[ORMColumn]
    private ?int $id = null;

    #[ORMColumn(length: 255)]
    private ?string $test_me = null;

    public function getId(): ?int
    {
        return $this->id;
    }

    public function getTestMe(): ?string
    {
        return $this->test_me;
    }

    public function setTestMe(string $test_me): self
    {
        $this->test_me = $test_me;

        return $this;
    }
}

However, after updating the code, i noticed that both the old and the new properties are being returned in an array (using API-Platform):

[
  {
      "test_me": "test",
      "testMe": "test",
      
    }
]

I have cleared the cache and Doctrine cache, and there is no other use of testMe in the project except for the getter and setter methods in the TestEntity class. I am not sure where the old property is being saved and why. Can you help me understand this issue?"

My composer.json to see my installed Bundles

{
  "type": "project",
  "license": "proprietary",
  "minimum-stability": "stable",
  "prefer-stable": true,
  "require": {
    "php": ">=8.1",
    "ext-ctype": "*",
    "ext-iconv": "*",
    "api-platform/core": "^3.1",
    "doctrine/annotations": "^2.0",
    "doctrine/doctrine-bundle": "^2.8",
    "doctrine/doctrine-migrations-bundle": "^3.2",
    "doctrine/orm": "^2.14",
    "easycorp/easyadmin-bundle": "*",
    "lexik/jwt-authentication-bundle": "^2.18",
    "nelmio/cors-bundle": "^2.3",
    "phpdocumentor/reflection-docblock": "^5.3",
    "phpstan/phpdoc-parser": "^1.16",
    "sensio/framework-extra-bundle": "*",
    "symfony/apache-pack": "^1.0",
    "symfony/asset": "6.2.*",
    "symfony/console": "6.2.*",
    "symfony/debug-bundle": "6.2.*",
    "symfony/doctrine-messenger": "6.2.*",
    "symfony/dotenv": "6.2.*",
    "symfony/expression-language": "6.2.*",
    "symfony/flex": "^2",
    "symfony/framework-bundle": "6.2.*",
    "symfony/http-client": "6.2.*",
    "symfony/mailer": "6.2.*",
    "symfony/messenger": "6.2.*",
    "symfony/monolog-bundle": "*",
    "symfony/notifier": "6.2.*",
    "symfony/property-access": "6.2.*",
    "symfony/property-info": "6.2.*",
    "symfony/runtime": "6.2.*",
    "symfony/security-bundle": "6.2.*",
    "symfony/sendgrid-mailer": "6.2.*",
    "symfony/serializer": "6.2.*",
    "symfony/twig-bundle": "6.2.*",
    "symfony/validator": "6.2.*",
    "symfony/web-profiler-bundle": "6.2.*",
    "symfony/yaml": "6.2.*",
    "symfonycasts/verify-email-bundle": "*",
    "twig/extra-bundle": "*",
    "twig/twig": "^2.12|^3.0"
  },
  "config": {
    "allow-plugins": {
      "php-http/discovery": true,
      "symfony/flex": true,
      "symfony/runtime": true
    },
    "sort-packages": true
  },
  "autoload": {
    "psr-4": {
      "App\": "src/"
    }
  },
  "autoload-dev": {
    "psr-4": {
      "App\Tests\": "tests/"
    }
  },
  "replace": {
    "symfony/polyfill-ctype": "*",
    "symfony/polyfill-iconv": "*",
    "symfony/polyfill-php72": "*",
    "symfony/polyfill-php73": "*",
    "symfony/polyfill-php74": "*",
    "symfony/polyfill-php80": "*",
    "symfony/polyfill-php81": "*"
  },
  "scripts": {
    "auto-scripts": {
      "cache:clear": "symfony-cmd",
      "assets:install %PUBLIC_DIR%": "symfony-cmd"
    },
    "post-install-cmd": [
      "@auto-scripts"
    ],
    "post-update-cmd": [
      "@auto-scripts"
    ]
  },
  "conflict": {
    "symfony/symfony": "*"
  },
  "extra": {
    "symfony": {
      "allow-contrib": false,
      "require": "6.2.*"
    }
  },
  "require-dev": {
    "symfony/maker-bundle": "^1.48"
  }
}