This effect is most common in some of the more elongated fancy cuts such as the oval cut, the pear cut, and the marquise cut. Some square shapes like the radiant cut can also show bowties, but apart from these, you’d be hard-pressed to find a bowtie in other diamonds cuts.
The reason this problem is so exclusively common in these shapes is that it is simply hard to avoid during the cutting process of elongated shapes such as these – their middle sections are too long and it can be difficult to cut the facets there to reflect light properly.