What the title says, the skull pike doesn't work if a block is directly above the skull, and resumes function as soon as I break the block. It works fine if you leave a gap between the skull and the block.

I'm using Quark 4.0-458 & Zeta 1.0-19.

Upper half slabs don't cause this issue.

Good catch. Mobs only run from the skull pike if they can "see" it, but ever since they were added in c025223 the calculation is done from the mob's eye position to one full block above the bottom of the pike entity.

So when there's a block on top, that point ends up inside a block, and mobs can't see it.