Thanks for posting this. We absolutely want to take a look into something like this, both in case of there being an unexpected bug (especially as no code was changed in the Promo) and also to get what you should have had should there be a verifiable bug.
We don't have a ticket in about this however, so we're unable to help further at present.
Can you submit a ticket here so we can look into this? Dev took a look over the weekend but we'd need the report/account this happened on to properly investigate. You can submit that here: https://support.runescape.com/hc/en-gb/articles/360001355429