I'm using Server Manager on Win 8.1 Update and have DHCP installed and running on a Server Core 2012 R2 domain controller. The BPA believes Option 3 (Default Gateway/Router) is not set. But it actually is set. It's set in the Server Options and appears in the Scope Options.
I've also confirmed that DHCP clients have the Default Gateway set properly so I know it's working as expected. I've even deleted and recreated the option but BPA still believes it's not set.
I could exclude this check from the BPA but I'd rather get to the bottom of it and correct whatever the issue is.