Bug: MySQL Errors are not reported

[din-psnl]

Describe the bug
When I insert the data to database using a model, If any MySQL errors exits, Its not being reported.

$userModel = new \App\Models\UserModel();

$newUser = [
	'name'	 	=> $this->request->getVar('name'),
	'username'	=> $this->request->getVar('username'),
	'email'		=> $this->request->getVar('email'),
	'password'	=> $this->request->getVar('password'),
];
 
$user_id = $userModel->insert($newUser);

// here the name column does not exists in the database 
$user_id returns '0'

//But when I try 

$userModel->errors();  //Returns nothing 

The only way I can see there is an error is var_dump($userModel) // and go through the whole array to see the error

and here is my model

namespace App\Models;

use CodeIgniter\Model;

class UserModel extends Model
{
    protected $table      = 'users';
    protected $primaryKey = 'id';

    protected $returnType     = 'array';
    protected $useSoftDeletes = true;

    protected $allowedFields = ['name', 'email', 'username','password'];

    protected $useTimestamps = true;
    protected $createdField  = 'created_at';
    protected $updatedField  = 'updated_at';
    protected $deletedField  = 'deleted_at';

    protected $validationRules    = [];
    protected $validationMessages = [];
    protected $skipValidation     = false;
 
} 

CodeIgniter 4 version
CodeIgniter 4.0.3

Affected module(s)
Models

Context

• OS: macOS Mojave
• Web server Apache
• PHP version : 7.4

[din-psnl]

Please also note in the above case that, if I use 'save' instead of 'insert' ie.

$user_id = $userModel->save($newUser); 

instead of

$user_id = $userModel->insert($newUser); 

$user_id always returns 1 when I have 0 or more records in 'users' table.