DHCP Option 121 is ignored if NPS IP Filtering is enabled

Hi All

I have the following setup:-

Server 2016 with RRAS, DHCP and NPS roles providing VPN access for remote users.

Two scenarios:-

1. Users with no NPS IP filtering policies will get a DHCP address and DHCP option 121 for classless routes.

2. Users with NPS IP filtering Policies (policy to allow only certain destination IPs and ports) will NOT get the classless routes.

Removing the IP filters from the users who would typically get them results in the routes being applied.

Why would simply enabling IP filtering on NPS stop DHCP from applying only option 121? - other DHCP options are applied.

Thanks!