System Information
LINUX CentOS 7.9 (3.10.0-1160.6.1.el7.x86_64)
Radeon Pro WX 4150 / Intel UHD P630
Blender Version
Blender 2.91.0
1> have an object / I affect it a color (just for display)
2> selectings faces from this object, i use the "P" key to detach faces from it and create a new objects with these faces
3> try to affect a new/ different color for this new object created with detached faces
Unfortunatly, the color change both for the new created objects and the old one from whom faces have been detached