This post explains why the RPI4 and zstick gen5 are not compatible
You should be able to purchase a low cost powered USB hub that would solve the issue. I don’t have an RPI but purchased this one for my system and it works well. The key is the USB hub you use must have external power to solve the issue.
https://www.amazon.com/gp/product/B084ZL93NH/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
If you’re good with soldering the linked post above also explains how to fix it.
Or, do as freshcoat suggested and use the old RPI3 to just run docker and zwavejsui. It will communicate fine with Home Assistant running on the RPI4.