Why new licences created on recurring, not just current update?

Thank you so much for your amazing module, so much appreciated 🌷

I have a question please. With recurring payments, when users unsubscribe I delete their previous licences except the cancelled one.

What I would like to know is why is it creating a new licence every time payment is made, surely it should just update the current licence?

Some have been members for years, generates pages of licences, when it should be just one, active or cancelled?

Thank you for any clarity, and if this is as designed, how can I clean the now unnecessary licences except the current one? Is that a good plan?