API PUT-Request results in Error 500

Hi,

i’m creating a new website which uses WooCommerceto present some hundred articles in ~250 categories. The articles are managed on an external application which sends all article-data via API to WordPress. The categories are managed in WooCommerce.

This basically works very well. Creating article, updating etc.

But: if i send a PUT-request to update an article including one or more categoryallocations it ends in an error 500. In this case only some of the article-data in WooCommerce get updated – but not the categories. In wc-logs I see in this moment an “allowed memory”-error which I cannot resolve with higher memory_limit.

Example request:

array(13) {
  ["name"]=>
  string(18) "testarticle"
  ["sku"]=>
  string(6) "010325"
  ["type"]=>
  string(6) "simple"
  ["status"]=>
  string(7) "private"
  ["description"]=>
  string(0) ""
  ["short_description"]=>
  string(39) ""
  ["price"]=>
  string(4) "1.29"
  ["regular_price"]=>
  string(4) "1.99"
  ["sale_price"]=>
  string(4) "1.29"
  ["categories"]=>
  array(1) {
    [0]=>
    array(1) {
      ["id"]=>
      int(201)
    }
  }
  ["images"]=>
  array(0) {
  }
  ["attributes"]=>
  array(1) {
    [0]=>
    array(2) {
      ["id"]=>
      int(1)
      ["options"]=>
      array(1) {
        [0]=>
        string(1) "0"
      }
    }
  }
}

The category with the id 201 exists in WooCommerce.
If it remove the categories-array the request ends with 201 – ok.

Wordpress 5.6
WooCommerce 4.9.2
PHP 7.3

Can anyone please help with this issue?