https://www.gamespot.com/articles/rainbow-six-siege-30-update-known-issues-revealed/1100-6452983/

The big new update for Rainbow Six: Siege, 3.0/Blood Orchid, is out now on the game's testing server for PC. You can see the complete list of massive patch notes here, which cover things like a new map, more operators, and more. The patch isn't without its problems, however. Now, Ubisoft has listed off all the known issues that players may encounter in it. Bugs are of course to be expected, given that the whole idea of a testing server is the hammer out the rough spots in preparation for the full release.

You can follow the instructions here to learn how to join Siege's Technical Test Server.