The provisioning templates use some variation of:

if host_enc['parameters']['realm'] && @host.realm

This requires the full ENC to be rendered for no good reason: the realm parameter is equivalent to @host.realm&.name (https://github.com/theforeman/foreman/blob/c28ab6ff1cd0b8fe77b853a5bfbd70ef86508af9/app/models/host_info_providers/static_info.rb#L54-L55). Since name is mandatory and we already check for @host.realm anyway we can drop the redundant check.