Via the Rocket League blog:

BUG FIXES

GENERAL

• Casual Matches will no longer cancel if the server does not have enough players. Bots will once again fill slots for missing players
• The “Find Match” button on the Matchmaking menu can now be selected/highlighted, allowing you to search for a match by pressing A (Xbox) or Cross (PS4) when the button is selected
• Further optimized Supersonic Trails that were causing performance issues on some hardware
• Fixed a bug with Quick Chat that caused players to automatically say “Great Pass!” or other options instead of being able to select an intended chat option
• Fixed a bug where typing in Party Chat in the Main Menu would skip songs in the selected Playlist
• Reverted a change that caused Controller Vibration to be weaker since the Anniversary update
• The “Hide Competitive Divisions” option will now work correctly with the new Find Match menu
• Corrected a suspension issue with the Batmobile and Mantis that caused them to be more visually elevated than pre-Anniversary Update
• Fixed issues with the grass on Champions Field on Low and Medium Graphics settings
• Fixed a bug with Spectator cameras focusing on the center of the field after a goal is scored
• Fixed issue where an item’s quality was not being verified during a trade
• Reduced Car Engine volume relative to other sounds and made distant cars less audible
• Corrected timing on Champions Field Announcer narration