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Sliders not visible since 2021-05 update for light-group entities if the light is off

See original GitHub issue

My Home Assistant version: 2021.05.x

My lovelace configuration method (GUI or yaml): GUI

What I am doing: Adding light group to UI with slider visible

What I expected to happen: Visible slider

What happened instead: No visible slider until light is turned on

Minimal steps to reproduce: Create light group, add light group entity to UI

# UI
entity: light.family_room_overhead_light
type: 'custom:slider-entity-row'
toggle: true
name: Family Room

# Light group (this is 4 identical RGBW bulbs, Inovelli Ilumin specifically)
light:
  - platform: group
    name: Family Room Overhead Light
    entities:
      - light.family_room_overhead_rgbw1
      - light.family_room_overhead_rgbw2
      - light.family_room_overhead_rgbw3
      - light.family_room_overhead_rgbw4

Error messages from the browser console: None

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Have made sure I am using the latest version of the plugin.
Have followed the troubleshooting steps of the “Common Problems” section of https://github.com/thomasloven/hass-config/wiki/Lovelace-Plugins.
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