24.04 Subiquity Cannot Read Auto-install Cloud-init Files

[Chris]

Since changing my PXE setup to serve a 24.04 ISO, I haven't been able to get the auto-installer to read any preseed files. I load the ISO and YAML from a local HTTP server, as always.
Curiously, the second resolution for my server's name (to download the preseed) always fails, so I had to change the line in GRUB to use the IP. Is it just me?

Possible Subiquity Bug:
I've tried a few different files for cloud-init, but it fails to read them all the same way. I always receive the following error:

Error parsing preconfiguration file: Syntax error: unable to determine template owner

I tried the same file that I've always used as well as one copied from a new server running 24.04 so I'm not sure what to do and searching for that error online didn't yield anything helpful.