If I model these two half spheres with the Shell Tool, and set their Trimming Body to Editable, then select both elements and use the Connect > Trim Elements to Roof/Shell context menu command, then it will give me a correct result.
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AMD Ryzen9 5900X CPU, 64 GB RAM 3600 MHz, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), Windows 10 PRO ENG, Ac20-Ac28
