GNOME apps in Kubuntu 19.10 doesn't respect GNOME window settings

[Adam Golański]

All GNOME/Gtk apps in Kubuntu 19.10 ignore gnome settings, both from gui and cli tool.
i.e. setting schema button-layout in org.gnome.desktop.wm.preferences from default 'appmenu:close' to custom 'close,minimize,maximize:' doesn't have any effect - gtk window widgets are always on the right, while KDE ones are on left, as set in KDE settings.

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: xorg 1:7.7+19ubuntu12
ProcVersionSignature: Ubuntu 5.3.0-23.25-generic 5.3.7
Uname: Linux 5.3.0-23-generic x86_64
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
BootLog: Error: [Errno 13] Brak dostępu: '/var/log/boot.log'
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: KDE
Date: Thu Nov 28 11:13:01 2019
DistUpgraded: Fresh install
DistroCodename: eoan
DistroVariant: ubuntu
ExtraDebuggingInterest: I just need to know a workaround
GraphicsCard:
 Intel Corporation Skylake GT2 [HD Graphics 520] [8086:1916] (rev 07) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Skylake GT2 [HD Graphics 520] [17aa:5059]
InstallationDate: Installed on 2019-10-29 (29 days ago)
InstallationMedia: Kubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
MachineType: LENOVO 20GKS0HQ00
ProcEnviron:
 LANGUAGE=
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=pl_PL.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.3.0-23-generic root=/dev/mapper/vgkubuntu-root ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/05/2016
dmi.bios.vendor: LENOVO
dmi.bios.version: R0CET27W (1.15 )
dmi.board.asset.tag: 0000
dmi.board.name: 20GKS0HQ00
dmi.board.vendor: LENOVO
dmi.board.version: S
dmi.chassis.asset.tag: 0000
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrR0CET27W(1.15):bd09/05/2016:svnLENOVO:pn20GKS0HQ00:pvrThinkPad13:rvnLENOVO:rn20GKS0HQ00:rvrS:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad 13
dmi.product.name: 20GKS0HQ00
dmi.product.sku: LENOVO_MT_20GK_BU_Think_FM_ThinkPad 13
dmi.product.version: ThinkPad 13
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.99-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 19.2.1-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.5+git20191008-0ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.0.1-1ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20190815-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1