Somewhat similar for me. My story.
I hadn’t touched Ruby on Rails before, or done much with Redux, and both of those were used in a product I was working on when I joined.
It’s difficult, but learning to overcome that is just part of the job.
Recently I had to start maintaining a clojurescript app at work. The developer that implemented it left years ago, so despite my never having touched clojurescript before, now it’s just another thing I have to learn in the job. And graphql, actually.
I’m always learning!