[4.14.6] [Arch Linux] xfwm4 sometimes dumps core

I get random core dumps of xfwm4 since some time and can't get the real cause for them. I never had any of these issues before and I'm using XFCE for a long time now. Maybe it has started since I merged two screens into one screen using xrandr but I'm just assuming this. But one by one:

Tech details: xfwm4 -V

	This is xfwm4 version 4.14.5 (revision d331c9b20) for Xfce 4.14
	Released under the terms of the GNU General Public License.
	Compiled against GTK+-3.24.21, using GTK+-3.24.23.

	Build configuration and supported features:
	- Startup notification support:                 Yes
	- XSync support:                                Yes
	- Render support:                               Yes
	- Xrandr support:                               Yes
	- Xpresent support:                             Yes
	- Embedded compositor:                          Yes
	- Epoxy support:                                Yes
	- KDE systray proxy (deprecated):               No

Kernel: Linux MYMACHINE 5.4.72-1-MANJARO #1 SMP PREEMPT Sat Oct 17 11:06:19 UTC 2020 x86_64 GNU/Linux

OS: Manjaro / Arch x64 XFCE

What I already tried:

• Switch kernel (no change at all)

xrandr: xrandr

Thats the command I'm using to merge my screens: xrandr --setmonitor BigScreen auto DisplayPort-1,DisplayPort-2 ; sleep 2 ; xrandr --fb 5440x1922 ; sleep 5 ; xrandr --fb 5440x1920 ; xfce4-panel -r

Sometimes it crashes when I watch a video in pip mode within firefox but most of the time this works fine. So I couldn't get through whats the real cause.

Most of the time the xfwm4 crash goes alongside with a xfce4-panel crash. I also sometimes use this snippet to restart xfwm4 by hand after a crash: xfce4-panel -r & ; xfwm4 --replace & ; sleep 10 ; xfce4-panel -r

core dump output crash 1 (journalctl -xfe): coredump-1
core dump output crash 2 (journalctl -xfe): coredump-2

Seems like this is related to issue #433 (closed)

If you need more information or if I should try something just drop me a message. I will try to help.

Regards codiflow

EDIT: Changed thread title as this still happens after upgrade to 4.14.6