I'm willingly pigeonholing myself as a "software developer mostly working on the JVM" just to be honest about my (current) main strengths/experince.
Throwing me into a Go/Python/whatever project would first need some time for me to get up to speed with the language.
I do the same, but I also happen to acknowledge that I slowly transition into X Developer, depending on which project I am on.
It is the usual "Jack of all trades, master of none." consulting, but it does come in handy when we need to deal with mixed stacks end-to-end.
I'm a Software Engineer, and while I have my go-to tools, I'd like to think I make an informed choice to use what fits the task at hand .
An Engineer who's a comfortable polygot is perhaps also a better Engineer overall.