Following a direct link to group activity results in 400 error

Bug
1

Following a direct link to a group activity page results in a 400 error.
e.g: Discourse Meta

If you navigate via the UI it works fine
e.g. /groups > /groups/plugin_authors > /groups/plugin_authors/activity/posts

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Link to posts or mentions in group activity leads to error page
3

Opps this is a regression introduced in

Fixed in

Thank you @HAWK

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