I only had two dreams I can specifically remember being trans* related. In most of my dreams, I just "am", while living through my dream in first person pov. But in these two I was actually watching myself for about half of the dream from another perspective, while part of the dream was a first person pov again.
The first dream I had before I knew I was trans (around middle school), and is pretty weird as I now identify as neutrois/agender and asexual. I subconsciously think this was somehow my brain processing how I felt about myself and my gender/sexuality. I was born as a female by the way.
I was in a house. The house was on a hill in field of long grass. I don't know what I was running from, I just remember I was angry and felt trapped, so I started to run through the grass towards the forest in the middle of the night. I was a girl, and dressed in pretty girly clothes. When I reached the forest, I started to kiss an unidentifiable boy. Somehow after a few minutes, I became the boy and was kissing the girl but she didn't look like me anymore. I then wandered deeper into the forest and the dream ended.
I thought maybe it hinted towards the fact of me "being a lesbian", but that didn't make much sense as I didn't want to date anyone either. I now kind of think it was my mind mentally getting used the idea of me being more masculine in comparison to how I was raised. Or you know, it could have been my mind just being weird.

The second dream was in the past year, and I already knew I was trans for a few years by then. It wasn't so much weird as anticipating and mentally accepting my future, I was doing a lot of research on top surgery around that time.
It was after top surgery and I was in my room just waking up, I wasn't completely unscarred, but was mostly healed. I just smiled, it was very calming. I woke up in real life calm and happy from that dream, but yeah that didn't last long after I actually got up and went about my day.
I don't really think dreams mean much besides the fact of me processing my emotions, stresses or hopes. I have high anxiety, and dream often. They are pretty interesting though