I’m sorry but I appear to be a bit confused by your reply, are you physically losing Robux to this bug? As far as I know that isn’t a side-effect of this issue however perhaps I was wrong?
As an update to this, the reproduction steps have since changed as it is no longer possible to visually create new developer products with a zero price (which is sad to see, very difficult to test experience purchase features), however this issue still appears to affect existing developer products with this price last time I checked and if there are any API endpoints which still permit the creation of these products, those would likely be affected too.