Meaning of なんやけどな


I was translating a manga chapter and found this line:

> 蛍なんやけどな今行方不明になっててな

What's the meaning of なんやけどな?




「なんやけど」means 「なんだけど」in the Kansai dialect, mostly spoken in the Kansai region.
This sentence roughly means "About the fireflies, they're lost."

