Joined a game in the middle of round 1, and encountered the following bugs:
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The game would register pressing the drift button, but not register letting go of the drift button, causing the kart to drift continuously until the accelerate button was released.
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The item button registered on the first press, but did not register on any subsequent presses.
These bugs weren’t round-specific, and lasted until the end of the game. Subsequent games (after the map selection screen) no longer had these bugs.