pyside6-designer fails to launch in Linux

$ rm -rf venv

$ python3.9 -m venv venv

$ venv/bin/pip install --upgrade pip setuptools wheel
Collecting pip
  Using cached pip-20.3.3-py2.py3-none-any.whl (1.5 MB)
Collecting setuptools
  Using cached setuptools-51.0.0-py3-none-any.whl (785 kB)
Collecting wheel
  Using cached wheel-0.36.2-py2.py3-none-any.whl (35 kB)
Installing collected packages: pip, setuptools, wheel
  Attempting uninstall: pip
    Found existing installation: pip 20.2.3
    Uninstalling pip-20.2.3:
      Successfully uninstalled pip-20.2.3
  Attempting uninstall: setuptools
    Found existing installation: setuptools 49.2.1
    Uninstalling setuptools-49.2.1:
      Successfully uninstalled setuptools-49.2.1
Successfully installed pip-20.3.3 setuptools-51.0.0 wheel-0.36.2

$ venv/bin/pip install pyside6
Collecting pyside6
  Using cached PySide6-6.0.0-6.0.0-cp36.cp37.cp38.cp39-abi3-manylinux1_x86_64.whl (170.5 MB)
Collecting shiboken6==6.0.0
  Using cached shiboken6-6.0.0-6.0.0-cp36.cp37.cp38.cp39-abi3-manylinux1_x86_64.whl (964 kB)
Installing collected packages: shiboken6, pyside6
Successfully installed pyside6-6.0.0 shiboken6-6.0.0

$ venv/bin/pyside6-designer
Error: /home/altendky/venv/lib/python3.9/site-packages/PySide6/designer: error while loading shared libraries: libQt6DesignerComponents.so.6: cannot open shared object file: No such file or directory

while executing '/home/altendky/venv/lib/python3.9/site-packages/PySide6/designer'