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Relevant issue(s)
Fixes #8190
What does this do?
Fix logout issues
Why was this needed?
To fix unexpected behaviour and retain user browser sessions.
Implementation notes
Not 100% sure of the reason for this issue. I can only replicate this on WDTK and the Alaveteli staging environment. Running in production elsewhere works fine so I guess this could be due to how we have Apache/Varnish configured? /cc @sagepe
[skip changelog]