Why a node refused a forwarded command.
The forward's deadline passed before the node took it.
The node neither owns the command's partition nor is about to.
The forward is larger than the node's internal port takes (wow.internal.max-message-size): the node did not read it, so the sender runs the command itself.
wow.internal.max-message-size
The node does not know the command's aggregate or command type, such as a node of an older version.