I've actually observed this:
before summer they were advancing each week by 1 week,
later in summer, they kept working on the same week for 3 weeks, because of course, workers need their 5 weeks of vacation, even though there's a pandemic and there are emergencies, and the government is adding more and more immigration programs (I'm being sarcastic of course),
in August they were moving one week further every 2 weeks,
and finally, in September they got back to doing one week further each week,
and in October they did 2 weeks in one week once and then got back again to 1 week in 1 week,
this is the first time after that they do 2 weeks in one week but surprise they are still working on the same week one week after.