Niels
When bunq receives the final exchange rate from Mastercard at the moment of settlement the transaction will be updated in your bunq app and placed on top in your events overview. When opening the transaction you can see 'amount updated' below the amount and when you tap on "Need help with this payment' you can view the transaction history.
I think this (fairly new) information in the transaction screen in combination with a new push notification at the moment of settlement gives a very clear insight in the ZeroFX transaction.
Maybe I'm missing something here :D