Public IP Count Errors on Deployment With Public Assignments Disabled

{"build_id": "2014-10-13_05-29-37", "ostf_sha": "64cb59c681658a7a55cc2c09d079072a41beb346", "build_number": "63", "auth_required": true, "api": "1.0", "nailgun_sha": "88a94a11426d356540722593af1603e5089d442c", "production": "docker", "fuelmain_sha": "431350ba204146f815f0e51dd47bf44569ae1f6d", "astute_sha": "f5fbd89d1e0e1f22ef9ab2af26da5ffbfbf24b13", "feature_groups": ["experimental"], "release": "5.1.1", "release_versions": {"2014.1.1-5.1": {"VERSION": {"build_id": "2014-10-13_05-29-37", "ostf_sha": "64cb59c681658a7a55cc2c09d079072a41beb346", "build_number": "63", "api": "1.0", "nailgun_sha": "88a94a11426d356540722593af1603e5089d442c", "production": "docker", "fuelmain_sha": "431350ba204146f815f0e51dd47bf44569ae1f6d", "astute_sha": "f5fbd89d1e0e1f22ef9ab2af26da5ffbfbf24b13", "feature_groups": ["experimental"], "release": "5.1.1", "fuellib_sha": "46ad455514614ec2600314ac80191e0539ddfc04"}}}, "fuellib_sha": "46ad455514614ec2600314ac80191e0539ddfc04"}

1. Setup env with Ubuntu + HA + All Ceph options
2. Set Network as Neutron + GRE
3. Add a small range (enough for controllers + VIP) as the public network and leave the rest as floating
4. Leave 'Assign public network to all nodes' unchecked
5. Error will appear on deployment such as;

Error
Not enough IP addresses. Public network must have at least 22 IP addresses for the current environment.