Unable to set default empty array on promoted param on php 8.1

[quyle92]

Hi,
I try to fetch data using WithData trait for converting Eloquent model to a data object, but it does not return default empty array on promoted param when its value is null.
Here is my code:

class ActionData extends Data
{
    public function __construct(
        public BasicDetail $basic_detail;
        
    ){}
}
class BasicDetail extends Data
{
    public function __construct(
        public array $action_upgradeReplacements = [];
        public ?int $action_modifiedDv1Value,
   ){}
}

It works in php 8.0, but in php 8.1, it throws error: "Argument #1 ($action_upgradeReplacements) must be of type array, null given".
The wierd thing is when $action_modifiedDv1Value has default value like public ?int $action_modifiedDv1Value = 0, problem disappears.
I am sure why is that.
Can anyone help me with this please?
Thanks.