I just converted my project from version 4.8 to 4.9 and now when a pawn mesh is set to simulate physics it falls through the floor, whenever is set in the properties or through blueprint.
I already tried to set CCD and to set the collision to block all but nothing changed.
Also if I start from the 3rd person template the simulate physics tickbox in the mesh properties is grayed out and if I set it through blueprint it doesn’t go in ragdoll.
Even if you set this in the Character BP, you still need to click on the character itself in the world, go to the details panel, select mesh, and set it in there. FYI!