Change the default option to "Forget password immediately" when mounting a Luks usb drive
Solution 1:
I was looking for the same thing, but judging from a similar question that was answered on StackExchange, there isn't a way at present. It looks like the default behavior was changed from "Forget password immediately" to "Remember password until you log out", but absent some way to tweak this, the new default isn't going to work for some of us either.
Hope this helps!