Schedule Digest not working as expected

I have a workflow with a schedule digest to trigger every 4 hours. For testing purposes, I changed this time to every 2 minutes.
I have a logic to send different titles and bodies on my email template according to the step.total_count variable.

The issue I'm noticing is that it doesn't behave as expected. If I trigger this workflow once, I receive the email fine. The title is You have 1 new unread message.
But if I trigger this workflow many times, I still receive the email with the same title (and body).
And I believe this doesn't seem right because if I change from scheduled digest to regular digest, everything works as expected.

Do you have an idea of why this happens?
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