Bangladesh new s/n variety (2014) 10-taka note (B349d2) confirmed

B349d2: Like B349d1, but new Western digits in lower left serial number. Curiously, based upon prefixes, it appears that on 10-taka notes the lower left serial number went from Bengali digits from 2012 to 2014, then Western, back to Bengali in 2015, and reverting to Western yet again in the same year.

Courtesy of Dr. Airin Salim (echo_2020).