confirmation email not sending with devise async IF concerns are loaded

I'm using the latest version of this gem and I have the weirdest error !

I am trying to get the emails to be sent by active jobs with devise async.
Installed all the gems, and configured my User model as follows:

class User < ApplicationRecord
...
            # Include default devise modules.
            devise :database_authenticatable,
                    :recoverable, :rememberable, :trackable, :validatable,
                    :confirmable, :lockable, :async
            include DeviseTokenAuth::Concerns::User
...
end

Reset Token email works just fine, BUT confirm email just never get sent.

If I remove the concern:
include DeviseTokenAuth::Concerns::User

Then the email is generated just fine but ... well the whole user model does'nt work and the confirm action is broken.

I'm at a loss here as the concern normally registers a notification to devise ? Soooo why is only this one email not working ?

Thanks a lot

Start by reproducing the User model configuration shown in the issue, then compare confirmation and reset-token behavior with and without DeviseTokenAuth::Concerns::User. Done means confirmation email delivery works while the concern remains included and the confirmation action still functions.