lxd core24 spread image missing

[siennathesane]

When following the readme to set up lxd to build core24, this error occurs:

$ curl https://storage.googleapis.com/snapd-spread-core/lxd/lxd-spread-core24-img.tar.gz
<?xml version='1.0' encoding='UTF-8'?><Error><Code>NoSuchKey</Code><Message>The specified key does not exist.</Message><Details>No such object: snapd-spread-core/lxd/lxd-spread-core24-img.tar.gz</Details></Error>

However, both the core20 and core22 images are available.