Zwave RSSI diagnostic unavailable

Finally had time to update to current zwavejsui and HA. Very excited about the new zwave diagnostics!

Anyways, they are working except for the RSSI which shows unavailable.

Is this just a limitation of the gen5 stick

Zwavejsui docker - 8.26.0
HASS docker - 2023.9.3
Aoetec gen5+ stick firmware 1.1
Device - Aeotec Smart Switch 7 - ZWA023 - v 1.3.1