Unfallen Don't Vine Through Wormhole

I was achievement hunting with the United Empire with the Unfallen as my sole opponent. When I finally found them, I saw that they hadn't vined anything down the wormhole out of their starter system, although they'd vined up the regular warp lane link. The attached save is just after I booted out the vineship fleet from the nebular cloud at the other end of the wormhole link. They'd clearly been sitting there for some time when I got there. I don't think they ever sent any more vineships out that way.

Vining bug.sav