block_menu_delete

block_menu_delete(Menu $menu)

function block_menu_delete(Menu $menu) {
  if (!$menu->isSyncing()) {
    foreach (Block::loadMultiple() as $block) {
      if ($block->getPluginId() == 'system_menu_block:' . $menu->id()) {
        $block->delete();
      }
    }
  }
}