System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GT 730/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.50

Blender Version
Broken: version: 2.83 (sub 11), branch: master, commit date: 2020-03-28 20:40, hash: rBa24f52c51cff
Worked: N/A

Short description of error
Bridge Edge Loops operation result is different when mesh is duplicated in Edit Mode vs. duplicated in Object Mode and joined into one object.

Exact steps for others to reproduce the error

Works in default startup file.

1. Add plane through Add > Mesh > Plane
2. In Edit Mode duplicate it and move the duplicate a bit sideways (along X or Y axis)
3. Select All vertices and go Edge > Bridge Edge Loops to connect them with an arch. Set Number of cuts to 2+.
4. The resulting arch is weirdly 'cut' in the middle, introduces non-manifold faces and flipped normals.

No such issues occur when the original plane is duplicated in Object Mode and joined into one object. Only direct duplicating in Edit Mode causes this behavior.

Duplicated in Edit Mode. Gives weird results.

Duplicated in Object mode and joined. Creates a nice arch.

Thanks a lot for looking into this problem.