server – Ubuntu 20.04 installer downloads ISO more than once

I have been working through the example posted by Andrew Lowther at Automated 20.04 Server Installation using PXE and live server image . For example using a linux cmdline similar to:

linux /vmlinuz ip=dhcp url=http://${pxe_default_server}/tftp/ubuntu-20.04-live-server-amd64.iso autoinstall ds=nocloud-net;s=http://${pxe_default_server}/tftp/

….and got things working (Thanks Andrew!)

Another question I have after working with this a bit. As one can see, the installer is going to downlaoad the ISO from http://${pxe_default_server}/tftp/ubuntu-20.04-live-server-amd64.iso in that example. In my httpd logs, I can see that the ISO gets downloaded 3 times over the network when doing one automated install. Is there a way I can make it not do that?

192.168.1.225 - - (06/Apr/2021:22:09:47 +0000) "GET /ubuntu-20.04.1-live-server-amd64.iso HTTP/1.1" 200 958398464 "-" "Wget"
192.168.1.225 - - (06/Apr/2021:22:13:24 +0000) "GET /ubuntu-20.04.1-live-server-amd64.iso HTTP/1.1" 200 958398464 "-" "Cloud-Init/20.2-45-g5f7825e2-0ubuntu1~20.04.1"
192.68.1.225 - - (06/Apr/2021:22:16:50 +0000) "GET /ubuntu-20.04.1-live-server-amd64.iso HTTP/1.1" 200 958398464 "-" "Cloud-Init/20.2-45-g5f7825e2-0ubuntu1~20.04.1"

Thanks!