There's a vendor recipe that converts a map from an old series to the current series. This uses specific mappings that we set up (each map converting to a specific type).
The Map Stash Tab had conversion functionality that would follow the vendor recipes rules until the resultant subtab became full. At that point, it would convert maps to another type at that tier.
When redoing the Map Tab recently, we realised that this behaviour is technically slightly pay-to-win, because it allows players who have paid money to get higher control over what items they get, compared to players who have to use the free vendor functionality. This functionality should not have existed like this and has been removed.
From the feedback after the patch, it's clear that players would like some form of this control to be available (or at least a more fair spread of maps as output). We're going to think about the best way to implement this, noting that if we do restore it, it'll be ...
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