A couple of days ago I received this issue.

A user wanted to receive polyfills for iOS 15.7.2, but with browserslist query ios >= 15.7.2 he received only polyfills for iOS 16+.

The reason is here:

The result of ios >= 15.8 contains 15.6-15.8 (it seems because of an alias).
The result of ios >= 15.6 contains 15.6-15.8.
The result of ios >= 15.6.1 contains 15.6-15.8.
Even the result of ios >= 15.6.100500 contains 15.6-15.8.

But ios >= 15.7 or ios >= 15.7.2 - not.

And ios >= 15.8.1 also returns only 16+, but it seems by another reason (15.8 < 15.8.1 by semver, but 15.8.1 contained in 15.6-15.8 data).

I believe that such cases should work.