I’ve only heard it pronounced with a hard g when listening to critical role, and the person that pronounced it that way (more like giggle but starting with an s) got razzed for it.

Listening to audio books I hear a lot of words that make me cringe or wonder if I’ve been wrong all these years, after all these are professional voice actors that presumably have directors or producers that correct them when they’re wrong, right?

Also I read a lot as a kid, And didn’t watch or listen to a lot of media, so I mispronounce things all the time. My favorite is primer as in a small introduction to a topic. This has always been prime-ur in my mind, makes sense as that is the term for the small charge that ignites the big charge in a bullet. The word is actually pronounced primm-er.

D&D is likely written by people who have similarly focused on the written, not spoken word. Don’t trust any of their pronunciations.