I really need some advice.

I really need some advice. I work for a company that has many opportunities to grow. This includes having programs for short and long-term assignments as part of growth initiatives. In the years that have worked in this company, I've always had successful end-of-the-year reviews but for some reason when I request to participate in a short-term assignment, I am told no and I can't afford to lose you. Most of my 1:1 are canceled or done in 5-7 minutes without content related to work but since I have always been seen as an outstanding performer, I didn't really give it much thought until now. I completed my mid-year review for 2023 with objectives completed and exceeding in some cases along with positive feedback from my customers that I have worked with in 2023. When I read my mid-year from my manager, he provided unrelated and false narratives about my character and work. For example, stated I had projects when I didn't. He me for missing a team meeting in writing so I could handle the priority work that he gave me but told me even though I said yes, it doesn't mean I validated it as being Ok. Please keep in mind, the 1:1 meeting only last 30 minutes with him playing trivia games with the team. So work related actions were ever missed and with the canceled 1:1 no feedback of missing anything was ever verbalized or noted. Lastly, stated I took the same vacation in December at the same time as the previous year even though he approved the vacation. There is indeed more but I am completely taken aback. Even with the support of peers outside the group and going back and forth with HR to clear things up. I feel completely violated. What makes it worse, this manager didn't even read my mid-year but just provided un-warranted feedback. HELP