Looks like patchset 2026-01-07 [1] should at least have the WoL issue fixed: ”net: ipv4: fix regression in local-broadcast routes” (more in [2]). Whether this helps with the other, ”Network is unreachable” issues, I wouldn’t know.

*[1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2137664
*[2] https://lore.kernel.org/regressions/20250822165231.4353-4-bacs@librecast.net/