What OS version are you running on the Z-Net? Did you keep your original SD card (as suggested) and if so, does it still work?
If you run the command:
ls -la /dev/ttyA*
What are the results?
On my Z-Net running Debian 11 the z-wave controller is /dev/ttyAMA0
On my Z-Net running Raspian 8 (the shipped OS) the z-wave controller is /dev/ttyACM0
That maps the host device ttyAMA0 to zwave for docker, so in the docker container only /dev/zwave will work as ttyAMA0 doesn’t exist (Not passed to docker by that name).
[edit] Ignore. In case helpful to anyone else, I was having trouble connecting to my Z-NET from zwave-js-ui, but I must have had extra spaces in the tcp address.