Metrica's steam ogre portals buggy
Every time the ogre has come up, I’ve seen people complain that the portal is bugged.
However, it appears to me that the numbers of people affected are increasing, including long-time players such as the OP. I’m willing to believe that there’s something new going on that’s causing more people to fall instead of land.
Perhaps this is related to the newly introduced falling damage bug
John Smith: “you should kill monsters, because killing monsters is awesome.”
I fell into that water pit once when I’m supposed to warp on the suspended platform. I swam up to the surface and I finally got teleported to the platform few seconds later.
After taking down the Champion Steam Ogre, don’t “dodge” into the portal exit. From my experience, it makes you fall from the platform after it shows a “loading” screen.