LN nodes with no network addresses

I’m trying to create a graph of the LN network using data from https://ln.fiatjaf.com/.
I used the channel data to get all the active channels for any given duration and created a graph using the nodes of the said channels.
The next step was to find the largest connected component that yielded 20k LN nodes. Of 20k LN nodes, a good portion (~5k nodes) do not have an address field. This data was queried using https://1ml.com/.
I was just trying to find if there is any reason behind it, because based on my understanding if a node is part of a fully connected component, it should have one of IPv4, IPv6, or an onion address.