Seems like the culprit is the following commit.
commit 7199531ff155c76cc323002967de35cea28e727a (HEAD)
Author: Simon Kelley <[email protected]>
Date: Thu Dec 5 17:07:40 2024 +0000
Add --dhcp-option-pxe config.
This acts almost exactly like --dhcp-option except that the defined option
is only sent when replying to PXE clients. More importantly, these
options are sent in reply PXE clients when dnsmasq in acting in PXE
proxy mode. In PXE proxy mode, the set of options sent is defined by
the PXE standard and the normal set of options is not sent. This config
allows arbitrary options in PXE-proxy replies. A typical use-case is
to send option 175 to iPXE. Thanks to Jason Berry for finding the
requirement for this.
** Bug watch added: github.com/ltsp/ltsp/issues #952
https://github.com/ltsp/ltsp/issues/952
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https://bugs.launchpad.net/bugs/2166430
Title:
dnsmasq 2.91-0ubuntu0.24.04.1 update broke ProxyDHCP mode; please stop
the phased update
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