Juatalotli's Medallion not working

I have 54/60 crystals and ive looked all over for mention of bugs or glitches. A friend whose new to the game I was explaining the new temple mechanic too and invited him to my party and we ran my temple. At the end it wouldn't allow me to highlight the last room in my snake chain to prevent it from destabilizing. He left the party and I ran a new temple and it still isn't letting me lock the last room in my chain.

Sometimes one can wonder if it's a bug or a feature

They fixed it, i can use the medallion on any Tier room