Particle system 2d color interpolation bug

[raduangelescu]

Cocos Creator version

3.8.8, 3.8.7

System information

Windows 11 Editor, Windows 11 browser

Issue description

When specifying different start and end colors for lifetimes bigger than 8s ( e.g 32 seconds) the particle color interpolation will fail (the start color will never change into the end color)

Relevant error log output

No response

Steps to reproduce

1. Create a test scene with a ParticlesSystem2d in it
2. Set Duration to -1 and lifetime to 32
3. Set Start color to white and end color to red
4. Notice that when running the game or in editor preview the particle does not change color during lifetime
   Note: If you lower the lifetime value to 6 seconds it will work.

Minimal reproduction project

No response

[raduangelescu]

Fixed issue in this PR: #19142