ovpn-client in versions above 7.20.X with more than 31 routes is broken. If fewer routes are transmitted, then ovpn works. If the version is lower then ovpn works.
ovpn-server is built on pfsense. They removed the archived versions of routerOS from the official website, so I took the long-downloaded version 7.18.2 and 7.19.6, everything works on both, and there are other versions on the network, including 7.20.X, where everything works.