hey, this only happens if you press the x button on the left to close the bar because that is handled by the system and BTT doesn't know when it's pressed (if you press the BTT icon this will not happen).
However in the latest alpha I have slightly changed the behavior - you may like the new one better.
I am also experiencing this issue, and I don't use the mode with the X to close BTT, I have it take over the touch bar entirely. But regardless, it only takes two taps to open the first time, right after you relaunch the app. Then it always opens with one tap until you restart it next time.