Object cahing problem

Hi,

it seems there is a problem when using the plugin in combination with object caching, e.g. redis with the “Redis Object Cache” plugin ( https://ww.wp.xz.cn/plugins/redis-cache/ )

While there are no errors thrown, once you re-order terms, save, and refresh the page, everything is back to their original order.

Hooking into ‘tto/update-order’ and calling wp_cache_flush(); seems to work.