so after running into shanice on a walk with the bot she suggested to open up the bot and try to find where came from, after reaching a burnt complex building the bot saw something called "DT" which bothered her, after coming back home my character went on a walk to clear his mind but after coming back home we found the bot gone and the game ended abruptly, is there a different ending to this?

I never got this bad ending, maybe it has something to do with her affection levels?

You can avoid this bad ending by telling the priest bot the truth a couple of days before ,when you meet the priest bot shortly after talking to Shanice about her feeling uneasy  about the priest bot , he will be kind  of sad/hurt but he understand her feelings. When you then go to the lab the priest bot will come with you  and he will deactivate the cameras that caught you inside lab, preventing the bad ending.