Bug: orderBy method fails afrer and before calling getCompiledSelect

[tscontenna]

PHP Version

8.3

CodeIgniter4 Version

4.6.0, 4.6.3

CodeIgniter4 Installation Method

Composer (as dependency to an existing project)

Which operating systems have you tested for this bug?

Linux

Which server did you use?

cli

Database

both of postgresql and mysql

What happened?

For debugging purpose, I check my SQL with getCompiledSelect(false) of query builder.
Calling orderBy() , getCompiledSelect() , orderBy() failes with TypeError.

Steps to Reproduce

Running code below anywhere (in a basic controller action or spark command)

$con = \Config\Database::connect();

$qb = $con->newQuery();
$qb->select("*")->from("t1");

echo "Calling orderBy() 1 -----\n";
$qb->orderBy("col1","desc");

echo "Calling orderBy() 2 -----\n";
$qb->orderBy("col2","desc");

$sql = $qb->getCompiledSelect(false);
echo "Result of getCompiledSelect() 1: {$sql} \n";
    
echo "Calling orderBy() 3 -----\n";
$qb->orderBy("col3","desc");

$sql = $qb->getCompiledSelect(false);
echo "Result of getCompiledSelect() 2: {$sql} \n";

then it fails with error:

[TypeError]
array_merge(): Argument #1 must be of type array, string given
at SYSTEMPATH/Database/BaseBuilder.php:1506

Backtrace:
  1    SYSTEMPATH/Database/BaseBuilder.php:1506
       array_merge('
ORDER BY `col1` DESC, `col2` DESC', [...])

When I remove getCompiledSelect() 1 or orderBy() 1 and orderBy() 2 or orderBy() 3,
It runs as expected and no error occurs.

Expected Output

Calling orderBy() 1 -----
Calling orderBy() 2 -----
Result of getCompiledSelect() 1:     SELECT * FROM `t1` ORDER BY `col1` DESC, `col2` DESC
Calling orderBy() 3 -----
Result of getCompiledSelect() 2:    SELECT * FROM `t1` ORDER BY `col1` DESC, `col2` DESC, `col3` DESC 

Anything else?

No response