What does it mean for a block to be colored red in Kaspa?

A block colored red in Kaspa has been included in the blockDAG as a parent but did not make it into the mergeset, so it does not contribute to the main consensus chain. In Kaspa, every block references earlier blocks as parents, which builds the structure of the directed acyclic graph. But the mergeset — the subset of blocks that actually feed consensus calculations like blue score and blue work — may exclude some of those parents, and those excluded blocks are colored red. This matters because it shows how Kaspa can include parallel blocks in its structure without letting all of them influence consensus, keeping agreement across the network intact even when blocks arrive at the same time.