In scenarios where:
- No member is logged in
- An 'AutoLoginHash' is provided via the 't' (token) query param
- The token isn't valid (determined by Member::validateAutoLoginToken())
The message which is intended to be returned to the end-user via $Content
in the template, is mistakenly double nested in ['Content' => ['Content' => 'Message']]
this leads to "The method forTemplate() doesn't exist on ArrayData" errors.
See - https://github.com/silverstripe/silverstripe-framework/issues/7866