WP could very well be that the terminal did not perform an online verification of your PIN. Only with online terminals that verify your PIN on bunq’s servers this will work. On the physical card there’s only storage space for a single PIN. So then only your primary PIN will work, the other can’t be “seen” by the terminal.
Oh, and as this is not really related to moving to Lithuania I’d say, open a new topic in case you have further questions about this. 🙂👍