Thank you for your reply. I based my topic on this answer: Is it possible to downgrade single packages? , probably it would be helpful if you can comment there as well.
Due to some other constraints, virtualenv was not a good choice for me.
This solution you had suggested worked great for me:
“Roll back the complete distro to previous version :
sudo swupd verify -m --fix --force
After that :
sudo swupd repair”
Thank you a lot!