HA 2026.8 raises ValueError(int('')) at entity ADD when a device_classed
snmp sensor's first render is empty (host down at boot/reload), so the
entity silently vanishes (artroom/garage/subopi3). Units alone keep the
°F/W/A display; automations are numeric_state, dashboards don't filter
on device_class.
https://projects.knownelement.com/issues/344#note-3916