Did some digging on the forum and found a thread from '20:
The suggested solution was manually starting the service and it :
1/ You stop the service
2/ You run the comand line twice : /var/opt/pwx/bin/px-runc run --name portworx --oci /var/opt/pwx/oci
Guess this will be needed on ech px worker node, gonna give it a try.
This also makes me think, might it be an issue related to Fedora Core OS ?