Change the cassette (and possibly the chainring if it showing wear).
You just fitted a new chain on a worn out drivetrain, even if it said 0.5 on the chain wear tool, there's always a possibility that a couple of sprockets is worn with the chain and likely to cause skipping.
Here’s the thing, I actually fitted the chain to a brand new cassette. I had some issues fitting the cassette to my freehub (detailed in the ‘ask any question’ thread) so put it on a spare rear wheel with an obliging freehub. It slipped on that new cassette too and then again when I reduced the chain length several times and again when I tried a different chain and a different cassette. I don’t know what is going on, or what I’m doing.
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Congrats to Tao on winning the Giro