I was having trouble deleting the duplicate faces when mirroring-Y and then doing the loop cut along Y. Issue was I had “X ray mode” still enabled when selecting the faces. This caused me to select the wrong faces and I couldn’t remove the right duplicates. Switching off X-Ray mode allowed me to select the correct duplicate faces.
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Or rotate the object!
Blender UI face mode selects the object face in front of the camera. Click again and it will select the item (face) behind the initially selected face.This works for object too.
In X-ray mode, it depends where you clicked in relation to the face center point (black dot). Selecting the face in front or back.
Have fun.
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