Same here, I do a reload if I answered incorrectly, but now, when I answer correctly, it just won't give me the normal 3 options for reward. I don't want to use a mod to get blueprints but this is getting very annoying as I have gone to 5 other manufacturing on the same planet and 2 from a different planet from a different system with the same no rewards bug.Seems like I ran into that once. I simply reloaded my last save from when I hopped out of my ship after landing at the landing location that's near the facility and answered the question again. If I'm honest, I always reload if I answer the question incorrectly because who knows when I'll encounter the next manufacturing facility and I'm not going to let the fact that it takes so long to learn enough words to decipher the "question" inhibit my ability to reap the rewards. Yes it's more realistic that it would take time to learn their language to the point that you understood it fluently but that's a grind I don't want to endure (particularly when there is something at stake). So I don't use the language mod, but I "cheat" that way. No different than reloading a quick save when you make a poor choice in any other game, except here it's not about skill. When only 1/4-1/3 of the words in a question are understandable and the rest is cryptic, it's often blind luck choosing the correct answer.
Another bug I've encountered is when you blow open a security door, enter the facility, and reload your last save. A few times when I've reloaded, the "status" of the facility is reset (meaning the security door is back and there are no alarms going off). Just have to keep reloading when that happens.
Just another in the list of small but annoying bugs, but not major enough to take away any lasting enjoyment.
Edit - I have gotten the other bug you mention but only once.