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Yes, that was what my first set was like.
Actually being too cheap to buy any more tyres for a while, I've stuck a thick puncture repair patch on the inside of the tyre under the cut and this seems to have sorted it. The last time I tried this failed totally, but I went to a bit more effort cleaning up the inside of the tyre first this time and it held without any issues for the whole of the ride I did yesterday.
Seems to be either or. I've had mine on tubeless for two years, with now a massive flat top on both, running around 55psi for commuting and they've been flawless. I can actually lean in the wet!
If I can't get the Strada Biancas in TLR when they come out, I'm going back to these.