Ah! Okay I think I figured it out (for real this time). xD I'm assuming you'd already visited all four date locations, right? The issue was that after the confession scene, it takes you back to the choose a location menu. But since you've already chosen all the locations, there was no where to pick, so it just took you to the next section in the code which just happened to be Dan Heng's confession scene.
Version 1.2.2 should fix the issue. Sorry for the inconvenience! Let me know if this wasn't the case and the problem persists or you have any more issues. And check out my walkthrough (it's in the dev logs) if you're having trouble getting that Jing Yuan ending. :3
Viewing post in Honkai: Star Rail Otome Fangame comments
its not that it took me to dan heng's scene right after jing yuan's scene (if i understood that correctly), but like u said i did all of the date locations and everything seemed fine, there was a scene where jing yuan said he came back to say goodbye and allat, and suddenly i think something went wrong and it triggered DH's scene (╥﹏╥) I'm downloading the new version now tho, so i'll let u know if it happens again ദ്ദി´ ˘ `)