iPad Pro on-screen keyboard not typing shift characters

When you touch-and-hold a key to expose the alternative/secondary characters, slide your finger to the character that you wish to select.

This functionality may become a little more obvious with some other keys - such as "e" - where you have many other alternatives from which to select:

For keys that have multiple alternative characters (such as the example "e"), you have always needed to slide to the chosen character. Arguably, the keyboard is now consistent in its behaviour across all keys for selection of alternative characters - regardless of having one or multiple alternatives.

For single character alternates, the downward flick remains available.