Invalid token for Previous submission message

Is [none] a valid token?

I assumed that much, because in the help on this field uses it:

Previous submission message
A message to be displayed when there is previous submission.Defaults to: You have already submitted this webform. View your previous submission. Enter [none] to hide this message.

Understood.

I am not getting the [none] invalid error via the attached webform.

Still, the "Previous submission message" to "[none]" to disable message behavior is not working as expected.

I tried to hide the message by setting it to [none] but the CKEditor reformats that to

<p>
    [none]
</p>

so instead of hiding the message it just displays the text [none]. Even entering the text in source mode doesn't help (it still gets reformatted on save). Exporting the webform, removing the paragraph tags, and importing it again works, but lost as soon as you edit the submissions setting page.

One way around the ckeditor p tag is to add a custom settings handler and override the limit message there:
limit_user_message: '[none]'

Automatically closed - issue fixed for 2 weeks with no activity.