So Sparks update brought a most unwelcome, undocumented feature where any blocks built by an NPC could not be welded to functional... yep wtf? why? let alone how?

This was a problem for me because to avoid PCU exploiting, another mod on my server assigns authorship ("Built By") to NPC blocks and this mod transfers authorship (and hence PCU) around as ownership changes. Not cool.

The flurry of updates of this mod has been to introduce a workaround which should not have been necessary but anyway... now NPC-owned blocks all revert to Built By: Nobody allowing welding. Once a player owns the majority of blocks on a grid he/she will then assert authorship over the whole grid, acquiring the PCU. Also, players trying to exploit PCU by transferring blocks to owned by Nobody won't benefit as the authorship stays with them. Win-win.