SMTP notification not recognized after update to 2024.4.2

I have custom SMTP notification configured in my configuration.yaml that stopped working after updating to 2024.4.2. The automation that uses it is displaying the following error in my Settings notifications:

The automation “foo” (automation.<foo> ) has an action that calls an unknown service: notify.smtp_dreamhost.

Did something change with regard to SMTP notifications in this latest release?