User is notified twice when they earn trust level 1

I just witnessed a case of a user being notified twice when they earned trust level 1. The two messages are exact copies of one another.

Discourse%20Duplicate%20Notification

We have not changed any settings in Trust Level. We have customized the text so it says “participant” instead of “basic”.

Was “Basic User” badge awarded twice too? (the badge is awarded when user is promoted)

I have checked mine of the last week, I just launched. Not a single one is a duplicate.

The badge was issued once.