I have a pagelayout override that matches on a section id, which works as intended, in that I go to the pagelayout_alt when I navigate to that section.

However, I've noticed something weird happening:

if I navigate from a page that uses pagelayout_alt to a page that has no section id - like user/* or extension/* - it ends up using the pagelayout_alt template.

But, if I navigate from a page that has a section id that does not match the override and go to a page with no section id (user/login again) it uses the pagelayout template.

This is the behaviour on multiple test machines/versions.