That isn't how to reverse a transition. To reverse it, choose the preset that wipes from B to A instead of A to B, like choosing the right left, hard edge preset instead of left right hard edge preset.
@lee-g - You have added a Transition Progression Envelope and then not adjusted that Envelope. Do you want to Control the Progression of the Envelope, for Reversing,, or just do what @fr0sty has suggested?
Given the language barrier, this is going to be tough. 🤨
Maybe just a misunderstanding of how Transition Progress works. The keyframes of Transition Progress define "no transition" if the keyframe is at a zero position (on the ground of the Event) and they define "full transition" if the keyframe is at top position. So its curve acts vice versa to the regular Event's transition curve. In other words: The keyframes and curve of Transition Progress control the transparency whereas the curve of the regular transition signals the opacity.
Not a bug but quite confusing from a certain point of view.