Glad to see Garmin changed the HR sensor cover from plastic to glass, this has totally resolved the skin burn issues I had to carefully manage with my 6X.
For those unaware, some users suffered contact dermatitis from the plastic HR sensor in the 6 (and 5) series. The small change to glass should hopefully be the end of this problem. Hopefully Garmin roll this out to their other devices as it wasn't just Fenix users affected.