Bug: env_ambient_light will hijack concequent maps missing it

[lunairekitty]

Describe the bug

If you load a map with env_ambient_light then load a map without that entity, that map will take on the ambient lighting color despite not having that entity at all. The only workaround is to make your maps with this entity and set all values to zero to prevent it's hijacking.

To Reproduce

1. Open a map with env_ambient_light
2. Load a map without one

Issue Map

Any map using or not using this entity.

Expected Behavior

The entity's effect should not persist between levels.

Operating System

Windows 11 (Microsoft Confidential)