To give them credit, I think this frame was design for 22mm or small tyres, but I totally see what you mean by the inaccurate cut out too.
In my experience tubular wheels are a bit smaller in diameter, together with some 22mm tyres would explain the "fail"
@Jaap started
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To give them credit, I think this frame was design for 22mm or small tyres, but I totally see what you mean by the inaccurate cut out too.