miriadquest

In an attempt to highhlight what is changing it we did put this snippet into the site (currently disabled) :

add_action(‘updated_post_meta’, function($meta_id, $object_id, $meta_key, $meta_value) {
if (!in_array($meta_key, [‘_stock’, ‘_stock_status’, ‘_backorders’, ‘_manage_stock’], true)) {
return;
}

$sku = get_post_meta($object_id, '_sku', true);
$trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);

error_log(
    'PRODUCT META UPDATED | Product ID: ' . $object_id .
    ' | SKU: ' . $sku .
    ' | Key: ' . $meta_key .
    ' | Value: ' . print_r($meta_value, true) .
    ' | Trace: ' . print_r($trace, true)
);

}, 10, 4);

And when we checked the debug log we found the following entries :
[22-Apr-2026 11:26:53 UTC] PHP Warning: Array to string conversion in /home/mqllife/public_html/wp-content/plugins/code-snippets-pro/php/snippet-ops.php(721) : eval()’d code on line 14
[22-Apr-2026 11:26:53 UTC] PRODUCT META UPDATED | Product ID: 373382 | SKU: 98656-291 | Key: _stock_status | Value: onbackorder | Trace: Array
[22-Apr-2026 11:26:53 UTC] PRODUCT UPDATED: 373382

Which looked to point towards a code snippet doing the change, but we chdecked all teh active snippets and could not fiond one that would be updating the status.
We even then disabled the code snippet pro plugin itself (in case there was some old snippet in there that we couldn’t see from the UI) and the issue was still happening

I can confirm that no changes are happening at the time. I can also confirm that our stock levels etc. are managed through a 3rd party plugin (The B2BConnect one).
This is syncing with our SAP B1 system through appseconnect. This talks to the WOO API to set the stock levels, but this runs once every two hours.
So I can confirm that the sync job is not causing it as the change from instock to backorder starts happening minutes after I set the status via the db.

I will get the logs over to you next