If I change my cassette to a new one, should I also change the chain?
I measured the chain with a wear gauge and it's ok.
Just to emphasize the obvious: I'm changing the cassette to one of exactly the same type.
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The consensus seems to be that a worn chain will accelerate cassette and chainring wear. I think if it’s not worn much (you could measure with a sliding caliper) you could keep using it. Otherwise install a new chain and use the current chain when it’s time for a chain replacement.
Worn chain on new chainrings can cause chain suck, but I think this is not the case for cassettes.