v3.5.7 fails to reconstruct long header

When postfix MTA agent receives a mail with header exceeding the line_length_limit param (default 2048), it fails to reconstruct the header upon delivery.
According to documentation:
"line_length_limit (default: 2048) Upon input, long lines are chopped up into pieces of at most this length; upon delivery, long lines are reconstructed."

It seems there is a degradation in ver 3.5.X that the header is not properly reconstructed, so that a new empty line is added after reaching limit length, thus the receiving MTA parse it as if the header section is completed (and a garbage in primary header received).

ver 3.4.X does not suffer from this issue.

Attached debug files:
postconfXXX files with the configuration
test_long.eml file with the sent message for reproduction. It contain header with 2049 length.
v3.X.X directories for latest and previous versions. Each directory contain: pcap, log output and delivered message.

Thanks