rP13541 Introduced a temporary this.repairTarget used to remove builders from a foundation/repairable when the builder changes states.
A problem with that occurs when the target transforms (e.g. (un)packs) for the this.repairTarget is not updated.
The solution used here is to update this.repairTarget OnGlobalEntityRenamed.
When one has fixed the above, another problem rises (also fixed in this diff). Builders are not transferred when an entity transforms, now they do.