System Information
Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 445.87

Blender Version
Broken: version: 2.91.0 Alpha, branch: boneMaster_290, commit date: 2020-07-28 08:12, hash: rBbebc13a59a72

Short description of error
Bridge do unwanted/inverted direction of arc and have unexpected different behaviour in silmolar situations

Expected: arcs and their surfaces follow normals.