Describe the feature you have in mind.

Soap in supplementaries is able to wash dyed blocks, but this doesn't work with the dyed terracotta bricks

This applies not only to dyed terracotta bricks but also curtains from another furniture.

https://github.com/thelegitdolt/dolt-mod-how/blob/1.20/src/main/java/com/dolthhaven/dolt_mod_how/integration/DMHSupplementariesCompat.java here's a class on how supplementaries's color api works