Chromium is not honoring IP version priority

Starting from version 69.0.3497.81 Chromium browser stopped honoring IP version priority configured in /etc/gai.conf. I have the following entry there:
===
# For sites which prefer IPv4 connections change the last line to
#
precedence ::ffff:0:0/96 100
===
Which should prioritize IPv4 over IPv6, but Chromium still uses IPv6 when available.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: chromium-browser 69.0.3497.81-0ubuntu0.16.04.1
ProcVersionSignature: Ubuntu 4.15.0-34.37~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-34-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CurrentDesktop: Unity
CurrentDmesg: Error: command ['dmesg'] failed with exit code 1: dmesg: read kernel buffer failed: Operation not permitted
DRM.card0-DP-1:
 enabled: disabled
 dpms: Off
 status: disconnected
 edid-base64:
 modes:
DRM.card0-DP-2:
 enabled: disabled
 dpms: Off
 status: disconnected
 edid-base64:
 modes:
DRM.card0-HDMI-A-1:
 enabled: disabled
 dpms: Off
 status: disconnected
 edid-base64:
 modes:
DRM.card0-HDMI-A-2:
 enabled: disabled
 dpms: Off
 status: disconnected
 edid-base64:
 modes:
DRM.card0-eDP-1:
 enabled: enabled
 dpms: On
 status: connected
 edid-base64: AP///////wANruUVAAAAABQaAQSVIhN4Aihll1lUjiceUFQAAAABAQEBAQEBAQEBAQEBAQEBtDuASnE4NEBQNmgAWMEQAAAYAAAA/gBOMTU2SENBLUVBQQogAAAA/gBDTU4KICAgICAgICAgAAAA/gBOMTU2SENBLUVBQQogANM=
 modes: 1920x1080
Date: Fri Sep 14 01:38:33 2018
Desktop-Session:
 'ubuntu'
 '/etc/xdg/xdg-ubuntu:/usr/share/upstart/xdg:/etc/xdg'
 '/usr/share/ubuntu:/usr/share/gnome:/usr/local/share:/usr/share:/var/lib/snapd/desktop'
DetectedPlugins:

Env:
 'None'
 'None'
Load-Avg-1min: 0.32
Load-Processes-Running-Percent: 0.1%
Lsusb:
 Bus 002 Device 002: ID 0bda:0316 Realtek Semiconductor Corp.
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 003: ID 13d3:5619 IMC Networks
 Bus 001 Device 002: ID 8087:0a2b Intel Corp.
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: LENOVO 20HAS20T00
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-34-generic root=/dev/mapper/afaians--ub16--vg-root ro quiet
SourcePackage: chromium-browser
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/07/2018
dmi.bios.vendor: LENOVO
dmi.bios.version: N1VET40W (1.30 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20HAS20T00
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrN1VET40W(1.30):bd02/07/2018:svnLENOVO:pn20HAS20T00:pvrThinkPadT570:rvnLENOVO:rn20HAS20T00:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad T570
dmi.product.name: 20HAS20T00
dmi.product.version: ThinkPad T570
dmi.sys.vendor: LENOVO
modified.conffile..etc.default.chromium-browser: [deleted]