Apologies, I wasn't clear in my answer or I am misunderstandingyour reply.

I see the vouchers still available in my account main page, but if I go in the section about more info, the past ones shown are only those until 2021 with no reference to what bookings they were applied to.

I'm writing from my phone now, otherwise I would have posted a screenshot as example. I don't know if I'm having account issues or it's normal what I'm seeing