Nah, all three gospels describe this ridiculous event as it appears in modern translations - mountain, personnel, shining, ghost appearances and mystery voice.
Matt 17, Koine Greek original and word-by-word translation into English.
https://biblehub.com/text/matthew/17-2.htm
DIGRESSION ALERT:
I've been looking into how 'knowledge' - or, rather, human thinking about what knowledge is - has evolved from about 1,000 BC to the Enlightenment and beyond. Basically, religion wasn't a cultural activity or even a shared belief system as we'd understand it today. It was just taken for granted that everything is an emanation of the supernatural, you weren't even independently responsible for your own thoughts. This predisposed people to accept all kinds of weird shit as "Just how things are".
Numerous people throughout the ancient world got a long way towards discovering the Scientific Method. It was what Greek philosophers were all about - they were major celebrities in their time - but always hit a mental block when it came to separating their reasoning from this internal supposition of divine purpose. Happened over and over again, for millennia.
I feel relieved when I get to the 18th century, and can see people figuring out that we are the originators of our own thoughts, which gives us the ability to examine how & why things happen without getting stuck at "because god says so". It was a massive revolution that took a long time coming. I'm not an epistemologist but there are reasonably credible theories that this is in fact an ongoing feature of evolution: our brains are developing an ability to think about themselves, which includes an understanding of the difference between conscious and unconscious thought/instinct.
So, yes, conspiracists and god botherers, I am suggesting your brains might be lagging slightly on the evolution front 😂