Why are my coworkers suddenly nice to me?

Im afraid I’m about to get fired. I’ve been working in a team with about 20 engineers for about a year now and normally they would hardly acknowledge me. Recently however they started smiling at me and waving to me. My new supervisor also wants to include me and wants me to join him and the others to lunch and coffee (maybe he pities me because the tasks I’ve been assigned recently are super boring). My former supervisors never made an effort to ask me to join them. I also noticed that my manager attended a presentation I held in front of 3 people even though he wasn’t even invited. Is that a sign I’m about to get fired?

Why are my coworkers suddenly nice to me?
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