I want to replace Quark's Vertical Slabs with this mod but when tying out this mod I easily found a bug that involves creating an infinite water source within a small wall made up of four horizontal stairs. When it creates a water source, for whatever reason it auto-updates the stairs the wrong way:

I also did this with slabs, and it does the same thing here:

I want to see if you can fix this bug so that I may use this mod. Cause otherwise I may have to go back to enabling Quark's vertical slabs.