The thread is deep enough, presta valve core goes all the way in ... I did a measurements over the threads of each valve core with a digital caliper, presta shows ~4,53mm while Clik valve shows ~4,60mm, it's a small difference but I guess enough to cause problems, and I think I can see that Clik threads are sharper, more defined compared to presta ... Here I took some photos how does it look:
Clik & Presta valve core side by side:
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How deep Click goes into VYTYV valve stem:
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It goes all the way into the Roval valve stem:
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