magento2 – Magento 2.2.6 Developer Configuration menu is missing (with Developer mode enabled)

After setting Magic Mode to Production and back to Developer, the Developer tab is missing under Configuration -> Advanced.

I'm in developer mode, cleaning all caches. Tried to re-log, clear browser cache, but no success. There are no errors in any of the logs.

Is there anything else I can try to get this configuration menu to work again?

Thank you in advance.