webhooks: ${SUBSCRIPTIONS.PLAN_CODE} inserts plan name

webhooks: ${SUBSCRIPTIONS.PLAN_CODE} inserts plan name

I'm trying to create a webhook that uses ${SUBSCRIPTIONS.PLAN_CODE} in the URL. I've inserted ${SUBSCRIPTIONS.PLAN_CODE} but it puts in the plan_name rather than the plan code.

It seems very strange that this could be a bug. Is anyone else using plan_codes in webhooks?