Default coloring of Cover icons does not work

[ChrisMuki]

My Home Assistant version: 2024.10.3

My lovelace configuration method (GUI or yaml): yaml

What I am doing:
i use this as entity in an entities card:

• type: custom:slider-entity-row
  entity: cover.drbl_1_ch1_a_dusche_rolladen

What I expected to happen:
As the plain "entity: cover.drbl_1_ch1_a_dusche_rolladen" changes its color when not fully closed, i would exspect this also for the custom clider enti

What happened instead:
Color does not change at all

Minimal steps to reproduce:

# The least ammount of code possible to reproduce my error
type: entities
title: Dusche
entities:
  - entity: cover.drbl_1_ch1_a_dusche_rolladen
  - type: custom:slider-entity-row
    entity: cover.drbl_1_ch1_a_dusche_rolladen
show_header_toggle: false
state_color: true
# End of code

Error messages from the browser console:

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