With respect, and appreciation of all the work that went into implementing this bridge, I would propose that it is just discontinued. It was an interesting experiment with good intentions, but I don’t think it is working out.
I think that @Mason phrased it well: there are cultural differences between the two communities. Automating cross-posting may not be warranted in this case.
FWIW, I decreased my involvement on Discourse because the noise just got to be too much.