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macOS 26.4 emits RTM_MISS on the routing socket for every failed route lookup. skipRouteMessage never inspected the message type, so each miss woke the monitor as a link change and triggered a netcheck. On networks without an IPv6 default route the netcheck's IPv6 DERP probes fail and emit more RTM_MISS messages, sustaining the loop indefinitely: netchecks run at roughly 40x the intended rate, with sustained probe traffic and corresponding CPU and battery cost. RTM_MISS scales with traffic volume, not network state, and is never the leading signal for a topology change: route withdrawals emit RTM_DELETE synchronously before any subsequent lookup can miss, so ignoring it loses no signal. Other routing daemons (bird, dhcpcd, frr) ignore it as well. Same fix as coder/tailscale@e956a95074. Fixes #19324 Signed-off-by: Doug Bryant <dougbryant@anthropic.com>