As of today, I cannot open any projects in Project Pro from a Project Server 2013 Project Center if the project contains a space in the name. My Project Pro comes from a Project Online subscription. I am using Internet Explorer, but tested and got the same results with Chrome and Edge. This has never been an issue until today. Projects without a space in the name still open just fine as all projects have prior to today. Also, I can still open all projects (space in the name or not) from Project Pro while connected to the Project Server 2013 instance. Was there an update recently that may be affecting the way Project Pro handles the space in the name when it receives it from Project Server?
I worked on similar issue couple of days back. The root cause was the security update KB4489886. Issue was resolved after uninstalling this update. ppmworks.com/project-names-with-a-space-fail-to-open-from-project-center/