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Given the following post, respond as if you're commenting on Reddit:
human
Student researcher lied to regarding publication and recognition

For context, everyone I mention (including myself) are student researchers at a very prestigious research university. I’m going to try and omit genders, ages, our field of study, etc. to try and keep this post from potentially biting me back. I can try and share more details in PMs or comments if it’ll help.

Earlier this year, as we were preparing to submit our research paper to a conference (on par with NIPS), our paper’s lead author lied to me about how we were going to be recognized in our work, literally seconds before s/he submitted our final draft to our journal. It was clear that my colleague lied in order to try to gain more recognition for himself/herself in our work. (I’m sorry for being vague as this situation is highly-specific to us. Happy to talk more in PMs.)

I thought it was an extremely egregious lie so I asked other more senior colleagues in my group about it. They all agreed it was extremely sketchy. One even remarked that it should be grounds to no longer work in our group. Yeah, it was that serious.

I approached our advisor (a full professor, highly-respected/admired, etc.) about the lie. S/he told me s/he noted the lie and my objection and told me to let it go. I trust my advisor to do the right thing and s/he’s been highly supportive. However, it irks me beyond belief that my advisor has trusted my colleague with even more work involving leadership of other students. And, nothing's been done to rectify the situation, either by correcting the error or disciplinarily.

I don’t know what to do and I’m frustrated beyond belief that I was cheated out of something I was clearly promised earlier on. I don’t know how to approach the situation anymore. I really just want to leave our group now but I don’t want to throw away the rapport I built with my professor.

I'm usually an extremely chill and composed person who has never lied in a professional context. However, being outright lied to by a colleague is beyond reproach for me, especially in academia. I don't know what to do... :(
gpt
Are you a grad student or an undergrad? Is the lead author a grad student, postdoc, or other professor? What was the type of contribution you made to the project (experimental design, data collection, analysis)? What percent of the total work in the project does that equate to? How much of your data is actually in the paper submitted for publication?