OpenVPN server not pushing route

Question

I've a OpenVPN 2.4.7 x86_64-pc-linux-gnu server running, which is providing around 120 routes.

There's an issue with one of the routes not being pushed to the clients.

In the server.conf file the route is added as follows:

push "route xx.xx.xx.xx 255.255.255.255"

The route works if it is added manually on the client device:

route add xx.xx.xx.xx/32 gateway

From the client side logs, the route does not appear at all in the list of server pushed routes and neither do any errors show up during the route push on the server side with the verbosity set to 9.

There are no conflicting routings, since each route is with an unique IP and the netmask of 255.255.255.255.