Z-Wave USB Stick is not working anymore when I plug a flashed CC2531 into the Raspberry PI

Hello,
unfortunately I was not able to find an answer in the community so I try to solve my issue with a new thread.

I have purchased and flashed a CC2531 Zigbee USB stick and now I would like to use this Zigbee USB Stick beside my existing Z-Wave USB-Stick (Z-Way.me UZB) so that I can use Home Assistant with Z-Wave and Zigbee devices. I´m using the Hassio image. Both devices are running without any issues when they are the only devices. But everytime when I plug the flashed CC2531 into the Raspberry PI in addition to the Z.Wave USB Stick and restart the Raspberry PI the Z-Wave USB stick is not working anymore. I have also tried it with the persistent names of the devices (“by-id”) but without success. The log file of OpenZWave doens´t give me really a hint what the issue is.

Do you have any ideas what I can do to use both USB devices at the same time?

Kind regards Robert

Check this out :==> [SOLVED] RFLink and CC2531 usb stick not working together