In recent years, provincial parliaments in Canada have increasingly used a legal mechanism known as the notwithstanding clause to suspend the constitutionally protected rights of Canadians. Often, legislation passed by invoking the clause has targeted the rights of various minority communities, such as transgender people or religious minorities. Traditionally, the only check on the clause's use has been the threat of public disapproval and controversy.
This is on the surface a fairly easy case factually to decide. The Supreme Court almost never holds over cases for argument. And the fact that it's doing so in this case is puzzling.