problem, and I can offer a solution for it.
The horizontal strip of tape is raised over the vertical side strip at the corner, and that raising, especially if done under tension, results in an angled gap that the tape caulk needs to fill. The rain water pressure eventually erodes the weakened caulk at that overlap, causing a leak.
My recommendation is to use a "butt joint" instead of the "overlapping joint". The horizontal strips should cover the top and bottom sides entirely, with the 2 vertical side strips butted against them at the corners.
The only disadvantage is that the butt joints will take more craftsmanship and detail work to complete. Maybe a couple more minutes of time would be needed. This should not be a problem for experienced trades people.