Regression: Mixing doesn't work properly

[fwcd]

Prerequisites

• Using npm
• Using an up-to-date main branch
• Using latest version of devtools. Check the docs for how to update
• Tried solutions mentioned in #400
• For issue in production release, add devtools output of DEBUG_PROD=true npm run build && npm start

Expected Behavior

In a scene like "Multi-Color" I'd expect multiple colors to be sent out via DMX:

Screen.Recording.2025-05-12.at.02.54.47.mov

Current Behavior

In this case, however, only the green channel is activated. The bug here is that presumably only the last split is considered:

Screen.Recording.2025-05-12.at.02.54.27.mov

Steps to Reproduce

1. Open a scene with more than one split
2. Observe that only the last split's color is sent via DMX

Possible Solution (Not obligatory)

The regression was introduced in abb831c according to a quick bisect.

Your Environment

• Node version : 16
• Operating System and version : macOS 15.4.1