Jinja2 extension returns string quotes around output

[rob101]

For example:
{{ '*baseTenant*.js'|manifest_match('<script src="{match}"></script>') }}

results in:

"<script src="/static/baseAddMembership~baseTenant~f585d785-baebc8a04938f4824d09.bundle.js"></script>"

Which means the script is displayed as text rather than as a script element.