There's a merged pull request on the void-packages repository

avahi: preserve default behavior for disallow-other-stacks
https://github.com/void-linux/void-packages/pull/18773

Description:
The void package for avahi overrides the default configuration for disallow-other-stacks, which causes avahi-daemon to bind port 5353. This is "recommended" practice by the Avahi maintainers, but is disabled by default to "not annoy people". In particular, setting this to true breaks the hpaio SANE driver, which attempts to use its own mDNS stack to search for network-connected scanners.

To be consistent with default avahi behavior, this PR undoes the override.