Spook reporting "area" field from flex-horseshoe-card as unknown area

[besteru]

What version of Spook are you using?

Version 5.4.0

What version of Home Assistant are you using?

Home Assistant Container Core 2026.9.1 Frontend 20260826.6

The problem

Spook lists all text in the "area" field in the HACS flex-horseshoe-card (https://github.com/AmoebeLabs/flex-horseshoe-card) as unknown areas in home assistant.
the syntax for the flex horseshoe card is:

type: custom:flex-horseshoe-card
entities:
  - entity: sensor.esp_gradina1_temperature_dht
    decimals: 1
    name: Garaj
    area: Garaj
    unit: °C
  - entity: sensor.esp_gradina1_humidity_dht
    decimals: 0
    unit: '%'
    icon: mdi:water-percent
  - entity: sensor.garaj1_temperature
    name: Temp 
    decimals: 0
    unit: °C
    icon: mdi:temperature-celsius
show:
  horseshoe_style: lineargradient

It should ignore area: field in this card

Anything in the logs? Paste it here!