How to Set Up KBanking

I’m using Kmymoney 5.1.2 on Kubuntu 22.04 since nearly two years with success. And I’m also able to do online banking with the Kbanking module and Aqbanking.
Some days ago I found a new version Kmymoney 5.1.3 on
Install KMyMoney on Kubuntu using the Snap Store | Snapcraft” which I thought to be useful for me, because I had some trouble with investments, online price quotes and online currency updates etc., and I thought the new version would provide some improvements on this topic.
Installing with “sudo snap install kmymoney” worked, and I can start Kmymoney 5.1.3, but it does not show Aqbanking under settings, similar as reported already in this topic and elsewhere for a MacOS-system:
KMyMoney V5.1.3 for MacOS 5.1.3 with KBanking plugin not showing Aqbanking under settings.
Opening my old “bankingfile.kmy” worked and I see all my bank accounts, transactions and bank postings, but online banking is not possible anymore.
Reading the various discussions on this topic, I think the Kmymoney snap package cannot find the AqBanking package.
I started Kmymoney 5.1.3 in a terminal and found the following passage in the output list:
<
Loading “/snap/kmymoney/2/usr/lib/x86_64-linux-gnu/qt5/plugins/kmymoney/kbanking.so”
“Plugins: kbanking loaded, build with (5.10.1stable-0/6.5.4.0stable), run with (5.10.1.0/6.5.4.0)”
3:2023/11/28 20-01-39:gwen(404984):plugin.c: 401: Plugin “dir” not found.
3:2023/11/28 20-01-39:(null)(404984):banking_cfg.c: 75: Could not create ConfigMgr[dir:///home/user/.aqbanking/settings6]. Maybe the gwenhywfar plugins are not installed?
7:2023-11-28 20:01:39:aqbanking started
3:2023-11-28 20:01:39:aqbanking banking_init.c: 403: No config manager. Maybe the gwenhywfar plugins are not installed correctly?
7:2023-11-28 20:01:39:aqbanking stopped
Could not initialize KBanking online banking interface

Since I’m not familiar with the snap data structure and the dependencies, I don’t know what to do now.
Thanks for your help.