Assist turns on lights with no color when i say "set my bedroom to red"

[CristianEduardMihai]

The problem

When using voice commands to set a room's lights to a specific color (e.g., "set my bedroom to red"), the system incorrectly activates all lights in the room, including monochromatic ones that cannot display the requested color.
Current behavior:

When requesting a color change for the bedroom, both color-capable and monochromatic lights are activated
Monochromatic lights (two lamps and main light) turn on despite being unable to display the requested color

Expected behavior:

Only lights capable of displaying the requested color should be activated
Monochromatic lights should be ignored for color-specific commands

Environment:

Tested with both OpenAI conversation agent and default Home Assistant agent
Identified as potential bug in HassLightSet component by @tete

What version of Home Assistant Core has the issue?

core-2024.12.5

What was the last working version of Home Assistant Core?

No response

What type of installation are you running?

Home Assistant OS

Integration causing the issue

conversation

Link to integration documentation on our website

https://www.home-assistant.io/integrations/conversation/

Diagnostics information

No response

Example YAML snippet

No response

Anything in the logs that might be useful for us?

No response

Additional information

No response

[home-assistant]

Hey there @home-assistant/core, @synesthesiam, mind taking a look at this issue as it has been labeled with an integration (conversation) you are listed as a code owner for? Thanks!

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