Describe the bug
If a backpack is dyed and placed in the world it just shows the default brown color. The color is back when it is picked up again and show correctly in the inventory and when worn on the back.

To Reproduce
Steps to reproduce the behavior:

1. Dye backpack
2. Backpack has the right color in inventory and when worn on back
3. Place in world
4. Dyed color is not shown anymore

Expected behavior
Keep the right colors when placed in the world

Versions
Minecraft Version 1.20.1
Forge Version 47.2.0
Sophisticated Core Version 0.5.89.425
Sophisticated Backpack Version 3.18.59.909

There was no response so I am going to assume it was caused by Rubidium's biome blend given that backpack tint works for me and many others.

Yes, sorry totally lost track of this problem! Installed the new version of Rubidium and the error is gone!

You have some mod in the modpack which breaks the colors. Just from quickly testing in 1.20 pack that I play this is what I can see

Or it may be the ancient version of SB you have there or it may be broken forge as I (and many other mod authors) don't really support forge post 47.1.5 due to broken stuff that was getting introduced there. If you want something newer try neoforge instead.

Thinking about this a bit more you may just be using older version of Rubidium which has implementation of biome blend which causes missing colors on modded blocks.