Hearthstone on China server recently adopted a minor change that makes Auto Reconnect(Auto restart game after lost connection) fails.
On China server, after Click play on battle.net launcher and the game window opens, the game waits few seconds for connection. Once it connects to the server, a window scene(see image below) shows up that requires user to click on it so the game will go to the main interface.
On other servers, there's no such window scene and the game automatically goes to the main interface.
As such, the bot does not click to pass the window scene on Hearthstone game window on China server(because the bot waits for the game to enter main interface), and the game window will never go to the main interface. Thus the game will never fully start and the bot eventually stops after waiting for game to initialize.

edit:
the issue is fixed now. thank you joy.

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The game will restart on "auto reconnect", and will stuck at the window (first image I posted). The bot will not click to continue and will wait until it thinks the game didn't connect(time out).
Please try yourself on China server and you will see the issue.
This does not happen on other servers, and is because Chinese law requires games to display such a window and the window will not auto pass to the next(main menu/main interface) until player read the message on the window and mouse click to pass it.
If you play hearthstone on China server regularly, you will see that the "click to start" message wasn't on that window before November(first image I posted), and before then the game will auto pass that window/scene to the main interface/main menu of hearthstone. Now it's different, it requires you to click to pass to the main menu, and the bot won't click it, and therefore the game stuck at that window forever.