Fix saving IPv6 over IPv4 tunneling NAT setting. Fixes #9264
(cherry picked from commit 3fcf5ad71216922921801d85d063d360fde5566f)
Fix saving IPv6 over IPv4 tunneling NAT setting. Fixes #9264
(cherry picked from commit 3fcf5ad71216922921801d85d063d360fde5566f)