perl utf8 corruption

I am using the perl module sapnwrfc to connect to SAP and retrieve reports. This module uses utf8 and when the data is returned some of the data has a pattern of utf8 character corru开发者_如何学运维ption. This appears to happen when a line in the SAP report is more than 4096 in length and my current thinking is that the read buffer of perl is splitting utf8 characters and causing the corruption.

$abap_lookup = $sap_rfc->function_lookup("REPORT");
$abap_program = $abap_lookup->create_function_call;

# set abap program input variables
$abap_program->REPORT($abap_program_name);
$abap_program->VARIANT($abap_variant_name);

# call the abap program
$abap_program->invoke;

$abap_program->DATA has the corruption in one place in each line that is more than 4Kb

This is the fragment with the corruption, the actual line is a byte or two more than 4Kb.

\x{f8fc}\x{2500}     \x{500}/\x{f8fc}\x{2500}

This is what is expected, so I am assuming something is splitting the line and causing the problem.

\x{f8fc}\x{2500}\x{f8fc}\x{2500}\x{f8fc}\x{2500}

I have tried all manner of open ':utf8' pragma and other settings (use utf8, binmode(STDIN, ":utf8"), binmode(STDOUT, ":utf8");). Also have tried to turn off buffering ($| = 1;). I cannot tell if this is a utf8 problem or a buffering problem. Does anyone know why this would be doing this and how to fix it?

was not able to figure out where the corruption is happening, but it is repeatable so I built a filter.