How to update Guix not destroying Xfce4 ?

[znavko]

Hello, Guix Help! I had issue with Xfce4, described here: 
https://lists.gnu.org/archive/html/bug-guix/2019-09/msg00070.html

Now time passed. But the same result.
After `guix pull && guix system reconfigure /etc/config.scm` I get unworkable 
Xfce4, menus do not displaying after each reboot.

I've made `guix pull --switch-generation=98 && guix system roll-back` after my 
new today's try. And this 98 generation's commit is ok.
But those commits from September 2019 are bad wrong. When use one of those 
september's commits and doing `guix system reconfigure /etc/config.scm` I get 
Xfce4 not works.

Here are my commits:

# guix describe

Generation 98 Aug 05 2019 22:59:02 (current)
 guix 7b88b71
 repository URL: https://git.savannah.gnu.org/git/guix.git
 branch: master
 commit: 7b88b7112045004479a788dda050dce940202adc

# guix pull -l > znavko-commits

Attached.

Please, I think something was changed, and my current config is wrong. Can you 
check it? Can you say what to do?

znavko-commits
Description: Binary data

znavko-config.scm
Description: Binary data