Disable 'manage_stock' in REST API for variable products

code.php

<?php

add_filter( 'woocommerce_rest_pre_insert_product_object', 'lpb_wc_disable_magage_stock_in_rest_api', 10, 2 );
function lpb_wc_disable_magage_stock_in_rest_api ( $product, $request ) {
  if ( 'yes' === get_option( 'woocommerce_manage_stock' ) && $product->is_type( 'variable' ) ) {
    if ( isset( $request['manage_stock'] ) && $request['manage_stock'] ) {
      unset( $request['manage_stock'] );
      $product->set_manage_stock( false );
    }
  }
  return $product;
}