From your additional examples it would seem that if the short form reference is +1 that in the main reference then you want a single hyperlink but if the short form reference is not +1 of the main reference you want two hyperlinks.

e.g. John 1:4,5
Matthew 5:12,13

should be single hyperlinks but

john 1:4,6
Matthew 5:12,14

would be two hyperlinks

To my eye this would indicate that references of the form

John 1:4,5

are typographical errors as they should have been written as

John 1:4-5

in the first instance.

Is this understanding correct?