[NEBULA] Cannot create Virtual Server Rule, same Public Port and Multiple Allowed Remote IPs

I am trying to create new virtual server rules to expose port 443 but to only allow access from a number of defined 'Allowed Remote IP' addresses. However if I create multiple rules for public port 443 and then try to add it several times with different Allowed Remote IP entries - such as 51.140.188.39 and 88.68.100.40 - I cannot Save and there is a warning about 'overlapping ports'.

So how can we create a rule to allow multiple remote ip addresses to access the same port? This must be a very common scenario as you don't want to expose ports to the entire internet or just one remote IP address or subnet?