There’s a minor bug with the Revenant Mace #1 skill: If you are not moving and start the auto-attack chain the first attack in the entire chain will have a significant delay before the chain will continue.
If you manually mash the 1 skill it will operate normally. If you are moving, or have JUST finished moving, the 1 skill will also operate normally and flow right into the auto-attack chain without the delay.
It’s only when you are standing still and start the auto-attack chain that the delay before the second attack in the chain will occur. As you can see in the below linked video, this is easily repeatable.
https://youtu.be/IidNXFJZRBA