You would only get a noise if the blade was already broken,I can’t see the split really well,depended where the split is.I’ve got one exactly the same and you’ve got me a bit worried now. What sort of noise was it? Ours often makes a deep sounding resonance at slow speeds. Took it down last July to service and saw hairline cracks on the blades.View attachment 1163571
If you call me on. 07799887111 I can advice