With translation disabled, you have to selectively translate the values yourself. If you "know" that the response to a particular OID is printable, you do not call hex_format(), and if it requires conversion, then you call it. It does not look like you have disabled translation because the hexadecimal value 30783061303033666665 in ASCII is "0x0a003ffe". So the response was translated, first by the module to ASCII "0x0a003ffe" and then by the hex_format() function to "0x30783061303033666665".