Short update:
Moved to Zwave-JS-UI 3 weeks ago - no issue what-so-ever and therefore removed Zwave binding 2 weeks ago.
Not regretting this change.
Should have done that way earlier, since finally all my use-cases are covered.
Additionally this issue Z-Wave Binding: Fibaro FGR-222 Rollershutter UP command not fully raising Blind is finally resolved as well.
Strongly recommending this change to anyone asking.