The BB plugin is only shown for tasks that have a status set to 'failed'. See check here.
But display tasks that have an execution task that has failed because of a test timeout have a status set to 'test-timed-out' so the plugin does not appear.
The execution task itself has a status set to 'failed' and its page shows the plugin.
Note: There are other places where the task status is compared to 'failed' in the UI so other features could be similarly impacted.