Did you look at this in layer view? Always check in layer view before you print it. If it's missing in layer view then it will be missing on the print. Guaranteed.
Also look at the part in xray view. If you see any red in this area then that's almost certainly the problem. Post screenshots of the problem in layer view and normal view and xray view please and you should get lots of suggestions.
Also, while waiting to have this post approved, I downloaded cura 4.0 beta and tried that, same problem occured.
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