It doesn’t. The printer knows what the last material that has been used with that nozzle, so when in your next job you assign a different material, it will simply purge the nozzle as it normally would.
Regarding your other post about the number of nozzles and the number spools in the AMS, it is not that those 2 extra slots are useless, because they could function as a spare for spools that are close to empty.
On the other hand you still have the possibility to do prints with up to 24 materials in one print and still have a lot of reduced poop when filament swaps are optimized.
Additionally if your next job needs different filaments, you can already preload those, just swap the build plate and press print for the next job.
Agreed on the benefits off more than 3 AMS slots connected to one Vortek
Where LR is the really fast Left to Right Nozzle Swaps, and V is Vortek and A is slow and wasteful AMS - I think the splits for the different types of tool changes with well placed colours within AMS’s, for models that don’t use every colour in every layer, could be along the lines of:
So for example even with a 16 colour model probably only 20% or less of the changes will end up in practice needing to be slow and wasteful full purging AMS changes.
Within a job I am sure there will be no purging when you switch back to the same colour in the same nozzle, however I am not sure that they will definitely do this when they eventually start doing multiple nozzle sizes on the same filament, plus whether they remember the filament and avoid purging out everything at the start of each print job is an open question too - especially for when non BL filaments are used in the AMS.
Nice analysis! Still the amount of waste is really depending upon how much filament changes there are in a layer.
And if there is a certain range of layers that stay below 8 filaments.
The Vortek might require a purge of a nozzle now and then, but when planning is optimized purging can be minimized.
We all have to wait and see when it is released and also the Bambu Studio version that comes with it.