Hyphenated words are inconsistently capitalized in title case

The bug

In strings written in title case (button labels, headings, etc.), there is an inconsistency in how capitalisation is applied to hyphenated words.

Sometimes, all the words linked by a hyphen are capitalised, but other strings only capitalise the first word in a group of words linked by a hyphen.

All words

First word only

Steps to reproduce

Pick one translation string from each table to search for in the vanilla language file. Search for them and note the two different capitalisation schemes.

Alternatively, you can test it in-game by giving yourself a firework star with the command below, then navigating the menus to find a string from the first table.

/give @s firework_star[firework_explosion = {shape: "star"}]

To find all hyphenated word pairs, run the following regular expression on the vanilla language file: \w-\w