Temporary closures are generally not mapped, especially if they are to reopen in a couple weeks.

The issue with temporary closures or edits is people make changes to show it is closed then forget about it.  So even though the road is open and back to normal, it has been forgotten about and remains marked and mapped as closed.

Additionally, GPS and Navigation apps that use OSM don't update regularly, sometimes just once a quarter, so even if it is marked as closed, it may not update within those apps for a few months.