Mempool rrd has wrong name

memory graphs don’t load in the webui.
This happens with existing and newly added devices.
The error is “No Data file for mempool-fortigate-system-0.rrd”.
This is correct, the file is called mempool-fortigate-0.rrd in the filesystem. I don’t know where this additional -system ist coming from. All other graphs work, cpu, temperature, etc.
Any idea how to fix this permanently?

I’m using the latest docker image from librenms/librenms.

librenms:/opt/librenms$ ./validate.php

Component Version
LibreNMS 22.2.1
DB Schema 2021_12_02_113537_ports_stp_designated_cost_change_to_int (234)
PHP 7.4.28
Python 3.9.7
MySQL 10.5.9-MariaDB-1:10.5.9+maria~focal
RRDTool 1.7.2
SNMP 5.9.1


[OK] Installed from package; no Composer required
[OK] Database connection successful
[OK] Database schema correct
[WARN] IPv6 is disabled on your server, you will not be able to add IPv6 devices.
[WARN] Non-git install, updates are manual or from package

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