Subject Prefix does not seem to work

1

I have set the email prefix to be something like ${tag:environment}

The email I have got is like the below:

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The prefix does not seem to use the tag QA but it appears to be ${tag:environment}

What is that I am missing here?

2

This issue still appears unresolved after over a year, even though the feature is clearly documented here: https://help.sentry.io/hc/en-us/articles/115001651153-Can-I-change-the-subject-line-for-alert-emails-

I have a subject prefix like: “[sentry-$project] $title”, yet my alert emails has this subject:
“[sentry-$project] $titleNEWDEV-D - Error: The input...”

I could just hardcode text into the prefix, but I want a trailing space after the “[]”, which Sentry insists on trimming.