Why does vertex color display white in 5.0.0-alpha.20 Version

InVersion 5.0.0-alpha.20 :

but in version 5.39.0:

The two versions use the same code. Do need some settings in 5.0 to use vertex colors?

As these versions are quite old, it will be difficult, if not impossible, to find the problem…

Can’t you use a more recent version that doesn’t have the problem?

Sorry, I cannot change the version of the project,

However, I found the key to the problem. If GLB uses Draco compression, colors greater than 0 in vertex colors will be 1, and colors equal to 0 will be 0