Castle construction screen, cliff nest has glowing pixel

[Branikolog]

Preliminary checks

• [X] I've checked that there aren't other open issues on the same topic.
• [X] I've checked that this issue is reproducible on the latest snapshot build.

Platform

Windows

Describe the bug

A small dot is shining in the Cliff Nest icon.

Save file

None.

Additional info

No response

[ihhub]

It's a fire detector. Nothing wrong with it.