PCI power control "auto" for unused ethernet device kills server

I want to save some energy, so I set the power control of all my PCI devices "auto". But if I do this with my unused ethernet device, this will crash the server if I change afterwards some network settings through the WebGUI (or execute ethtool as in the following example):

In Unraid:

# lspci -nn
...
07:00.0 Ethernet controller [0200]: Intel Corporation Ethernet Controller I225-LM [8086:15f2] (rev 03)

# ethtool -i eth0
driver: igc
version: 5.15.46-Unraid
firmware-version: 1057:8754
expansion-rom-version: 
bus-info: 0000:07:00.0
...

# echo "auto" > /sys/bus/pci/devices/0000:07:00.0/power/control

# ethtool -i eth0
... no reaction, server is dead, same happens if network settings are changed through Unraid WebGUI

In Ubuntu it can be changed from "auto" to "on" and vice versa without problems:

# echo "auto" > /sys/bus/pci/devices/0000:07:00.0/power/control

# ethtool enp7s0
Settings for enp7s0:
Cannot get device settings: No such device

# echo "on" > /sys/bus/pci/devices/0000:07:00.0/power/control

# ethtool -i enp7s0
driver: igc
version: 0.0.1-k
firmware-version:
expansion-rom-version:
bus-info: 0000:07:00.0
...

Note: Executing "powertop --auto-tune" does the same and as many users use powertop to save energy, they will probably  suffer from the same bug.