js-lingui: Message context (msgctxt) not working

Describe the bug When providing context to a message, the context is treated like an ID in the generated en.po file.

To Reproduce With the version 3.13.1 with create-react-app, and not specifying orderBy in lingui.config.js:

import { Trans } from "@lingui/react"

export default function App() {
  return <div>
    <Trans context='ctxtA'>My string</Trans>
    <Trans context='ctxtB'>My string</Trans>
    <Trans>My string</Trans>
  </div>
}

Expected behavior 3 messages should be created in the generated en.po file, like this:

#: src/App.tsx:11
msgid "My string"
msgstr "My string"

#: src/App.tsx:12
msgctxt "ctxtA"
msgid "My string"
msgstr "My string"

#: src/App.tsx:13
msgctxt "ctxtB"
msgid "My string"
msgstr "My string"

Actual behavior This is created in the en.po file.

#: src/App.tsx:11
msgid "My string"
msgstr "My string"

msgid "ctxtA"
msgstr "ctxtA"

msgid "ctxtB"
msgstr "ctxtB"

Additional context If using orderBy: 'origin' in lingui.config.js, an exception is thrown in getFirstOrigin() when running extract.

• jsLingui version 3.13.1
• Using create-react-app