renamer

That’s nice, but you forgot to add it in the HPOS filter woocommerce_shop_order_list_table_columns.

That would be very helpful! If you can just paste it here, that would be nice.

I would recommend using admin_enqueue_scripts hook instead of admin_init.

That just changes body class and it still gives the same results.

The problem seems to be Polylang. Filters work fine when Relevanssi is deactivated or when Polylang is deactivated. No clue what’s causing this.