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Panka
I'm not a sparky, etc.
Yeah, I'd expect the WAGO block blue is unconnected to anything at the other end (except hopefully another WAGO block rather than a dangling cable.).
As TW says, looks like they've used two sets of twin core and earth instead of a single three core and earth between this light switch and the other light switch.
It should have looked like the bottom one of this diagram:
With the brown tape indicating that all three wires are live/switched live.