It was not, tested on Osclass 8.0.0, behavior is same. It could never work like that and if it worked, it was bug. Maybe subcategory would work.
URL config should be unique, i.e using:
content/{PAGE_SLUG}
instead of:
{PAGE_SLUG}
Will make static pages uniquely identified (identification what kind of content is based on URL), so if I open:
domain.com/content/example-page
Osclass automatically identifies it is static page.