Bug: Adytum: Groldy can leave blockpad, so 1 block can get stuck

[wisprabbit]

Reported by DannySpillerVA. In Adytum, it is possible for a Groldy to leave its pad and join a different pad, meaning that the 1 block becomes stuck if it is rebirthed on the adandoned pad. Danny's screenshot:

Reproduced by Erik: "In Adytum, get northwest groldy to push a block west. Then get NW groldy to push block south. This disrupts the formation of the W groldy so he joins SW groldy. And that leaves no groldy at the W spot, which causes a soft-lock."

Erik: "Potential solution: add walls or pillars so the groldies won't push blocks toward perimeter. Potential solution #2: open the railing on perimeter to let block leave."