Expected Behavior

There should not be translation warning messages in the console for English when extensions are loaded. It's not visible because the default is English in any case, but it seems bad to have lots of warning messages.

_Note: I thought this was already documented, so this could be a _

Actual Behavior

When an extension is added, the warning message Translation for "messageId" in "en" is missing is shown for every block and menu item.
For example, after the music extension is added one of the messages is:
Translation for "music.drumSnare" in "en" is missing

Steps to Reproduce

Set your language to English. Open the console, then add the music extension.