It's the system maintenance that's required. The House motion says that no hybrid meetings will take place after December 11. There's some critical maintenance that needs to be done on the system to sustain up to 60 events per week, and the House administration has decided to do that between those dates, when the House is not supposed to sit.
Evidence of meeting #9 for International Trade in the 43rd Parliament, 2nd Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was businesses.
A video is available from Parliament.