Just call Preferences => Customize Color Scheme
and add this between the square brackets under "rules":
{
"name": "Mapping Key Names",
"scope": "meta.mapping.key string",
"foreground": "#ff79c6"
}
This will color everything like it used to be. Really weird change, by the way. Clearly a regression if you ask me. The syntax highlighting is almost useless without this. I thought it was broken before I found this issue.