Prusa 5 has developed an expensive taste and will only print Silk Gold PLA. Normal PLA and even PLA Pro (that nice teal one) work fine on Prusa 2, but Prusa 5’s printing bed does not allow such plebian colors to adhere, forcing them to accumulate around the nozzle instead.
I also noticed that it has a split stream when purging filament and, well after several purges, it still adds small and only partially melted lumps of a previously used color to a new project.