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@hippy
It's often poor derailler adjustment or a bent derailler hanger combined with frame flex that drops the chain.
But, seeing as you were changing parts around it's also likely to be OLD + NEW = POO.
You should keep a chain and cassette together. It's not often that a chainring would do this unless the chain is well worn.
Do you know where did the chain slipped? Front or back? Did it drop the chain or just derail and 'autochange'?