Error after suppressing a SMTP account in BackOffice

[PGK37]

Bug report

Error after removing SMTP

I had 2 SMTPs in my UVDESK settings, I deleted one of the 2 to clean up and following this modification I got the error
"You have requested a non-existent service "swiftmailer.mailer".

Issue Description

1. 2 SMTP Account
2. Deletion of the first created
3. The application ran for several seconds
4. Then Error ! (screenshot bellow)

Environnement

1. Version v1.1.3; Core Version v1.1.4
2. Connected in Administration mode in French (public/fr)
3. Server : PHP 8.0 / MysQL 8.0

[PGK37]

-- UPDATE --

When the initial swiftmailer.yaml file is put back in the config directory the application works.

swiftmailer:
    url: '%env(MAILER_URL)%'
    spool: { type: 'memory' }

so there seems to be a dependency with this file.
But why did it work initially and when you delete a Swiftmailer it crashes?