Ok just a few more things. First make sure that this block is an actor that is being replicated. So go to the CubeGroundTest blueprint in the left panel on the self component. Look for the replication tab and check the box that says replicates.
And secondly make sure the character variable Dead is set to replicate. To do it just click on the variable and a panel on the right should pop up, set the replication option to replicated.
Edit: I just saw another little detail. In the win loose event you are using the GetPlayerCharacter node to get the dead variable. But the thing is that you don’t need to do that. Just get the variable, since you already are inside the Character blueprint.