Problem in do_action when sanitizing the args passed

[salvamb]

We are running a do_action and passing a parameter like this:

<?php
array (
  0 => (object)[
     'product_id' => '24',
     'order_item_id' => '210',
     'order_id' => '480',
     'order_item_name' => 'Ship Your Idea 2 - Green',
  ]
);

And this array is being stripped by WordPress on plugin.php line 471 and passing only the inner object. So what is finally received on the action callbacks is:

<?PHP
(object)[
     'product_id' => '24',
     'order_item_id' => '210',
     'order_id' => '480',
     'order_item_name' => 'Ship Your Idea 2 - Green',
];

When I was expecting to receive an array and breaking forcing me to fix this on the callback.
This doesn't happen in all cases. Only when the array passed has just one item inside. If it has more than one, it passes the array correctly.
I understand this was done for backward compatibility but it shouldn't alter the params passed to the action or might have unexpected behaviors.

[SergeyBiryukov]

Hi there, welcome to WordPress Trac!

Thanks for the report, we're already tracking this issue in #55133.