For those of you with UX as a separate role from UI, what is the design process like at your company?

I am a product designer who has recently started to work at a company that segments the research+UX designer role from a separate UI designer role. I have not worked in a company with this separation before (traditionally, I've always done a product designer role where I was research + UX + UI).

I am curious for those who have worked at companies with a similar breakdown how the workflow process worked for you? At the moment, I'm discovering the process is very waterfall-esque where I am handed requirements by the product managers, I do research, wireframes, and usability testing, then my final wires are handed off to UI to "make them beautiful" and then UI hands them off to developers.

During this process, work is lost in translation. I am uncomfortable about the lack of communication between the disciplines. I don't like that I hand off my work to a UI person who then can alter the workflow I've proposed.

Anyone else in a similar boat? What workflow improvements can I suggest to this process?