For Bulgaria and Czech, Hirano and Shibata will be playing Women's Doubles together again. Not really sure what JTTA is trying to accomplish by using this pairing for 4 events in a row. Certainly, it would be wiser to experiment with players who have better chances at making the Olympic team. I'm still surprised they are not testing out Hirano/Ito or Hirano/Hayata or trying to make Ishikawa/Hirano work.
There isn't much time left before the Jan. 2020 deadline to select the Olympic Teams and figure out other doubles combinations that work. Right now, the Ito/Hayata pairing is the only Olympic-likely pairing that is proven to work. However, the problem is that at this point, there's no guarantee that Hayata will make a Olympics and if she doesn't, the Japanese Women's team will face the same problem the Men's team is facing of having no suitable doubles pairing in the Olympic team.
Given that Ishikawa and Ito are busy playing mixed doubles in these tournaments, I doubt JTTA would want to give them a 3rd event in Women's doubles. That leaves Hayata and Hirano free to play Women's Doubles, but JTTA is still insisting on the Hirano/Shibata pairing. It's a puzzling selection and not a good sign for Hayata.