squid TCP_MISS_ABORTED/000

[mocsokmike]

I have a working squid proxy. Recently I noticed some websites misbehave, there is one for example where we cannot send a form.
A TCP_MISS_ABORTED/000 error appears in my squid access.log file.
Other sites produce such lines too, but they seem to work nonetheless.
One particular site I use for reproducing the issue (and as such, for my debug tries) is:
http://garfield.com/comic/2015-03-12
Loading this URL behind my proxy creates this error in /var/log/squid/access.log:

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1426235912.366     16 <MY_IP> TCP_MISS_ABORTED/000 0 GET http://garfield.com/comic/2015-03-13 <MY_USERNAME> HIER_DIRECT/104.28.4.19 -

Anyone faced this problem before? My googleing did not bring solution in the past 24 hours.

Squid version and USE flags

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net-proxy/squid-3.5.1  USE="htcp pam ssl wccp wccpv2 -caps -ecap -esi (-ipf-transparent) -ipv6 -kerberos (-kqueue) -ldap -logrotate -mysql -nis (-pf-transparent) -postgres -qos -radius -samba -sasl (-selinux) -snmp -sqlite -ssl-crtd {-test} -tproxy"

/etc/squid/squid.conf

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auth_param basic program /usr/libexec/squid/basic_pam_auth
auth_param basic children 10
auth_param basic realm GU-Proxy
auth_param basic credentialsttl 1 minute
acl localnet src 10.0.0.0/24    # RFC1918 possible internal network
acl authenticated proxy_auth REQUIRED
acl CONNECT method CONNECT
acl http proto http
acl safe_ports port 80 81 443 1025-65535
acl whitelist dstdomain "/etc/squid/sites.whitelist.txt"
acl porn dstdomain "/etc/squid/sites.porn.txt"
acl porn-regex url_regex "/etc/squid/sites.porn-regex.txt"
acl warez dstdomain "/etc/squid/sites.warez.txt"
acl warez-auto url_regex "/etc/squid/sites.warez-auto.txt"
acl timewaster dstdomain "/etc/squid/sites.timewaster.txt"
acl timewaster-allowed proxy_auth "/etc/squid/users.timewaster-allowed.txt"
acl porn-allowed proxy_auth "/etc/squid/users.porn-allowed.txt"
acl workhours time MTWH 08:00-17:00
acl workhours time F 08:00-15:00
http_access allow localhost
http_access allow http safe_ports whitelist
http_access allow CONNECT safe_ports whitelist
http_access allow http safe_ports timewaster authenticated timewaster-allowed
http_access allow CONNECT safe_ports timewaster authenticated timewaster-allowed
http_access allow http safe_ports porn porn-regex authenticated porn-allowed !workhours
http_access allow CONNECT safe_ports porn porn-regex authenticated porn-allowed !workhours
http_access allow http safe_ports !porn !porn-regex !warez !warez-auto !timewaster authenticated
http_access allow CONNECT safe_ports !porn !porn-regex !warez !warez-auto !timewaster authenticated
http_access deny to_localhost
http_access deny all
http_port 3128
dns_v4_first on
cache_dir null /tmp
coredump_dir /var/cache/squid
refresh_pattern ^ftp:                   1440    20%     10080
refresh_pattern ^gopher:                        1440    0%      1440
refresh_pattern -i (/cgi-bin/|\?)       0       0%      0
refresh_pattern .                               0       20%     4320

EDIT
I am starting to believe the problem is not on my side. What makes me uncertain is the fact that my previous proxy (Squid 3.1.19, used as transparent proxy) didn't have this issue.