There will be online server re-start to fix an issue where match room filtering function has not been working properly in Open Match on June 9th, 10AM KST for about 10 minutes.
During the server restart, Online Mode will be closed but Freestyle and other Modes will be available for playing.
There will not be an update needed after the restart.
Thank you
23.06.09 Online server restart announcement
Source: Steam Community (opens in a new tab)