I found the error, the request was made using an <a href="" onclick="do_logout()"></a>, which was basically doing 2 actions at once and creating a race condition. Here is the relevant code snippet https://ideone.com/UUeYRw
Thanks for helping!

In reply to Re^3: Mojolicious session does not expire by Anonymous Monk
in thread Mojolicious session does not expire by petru.tr

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