I ran into the same issue while traveling in South America. Some ATMs would not work at all with my 8+ PIN.
Strangely, there was one ATM that accepted 4 digits and then automatically continued to verification of the PIN. I never got a chance to enter the rest of the digits, but it still passed verification and allowed me to withdraw.
Strangely, there was one ATM that accepted 4 digits and then automatically continued to verification of the PIN. I never got a chance to enter the rest of the digits, but it still passed verification and allowed me to withdraw.