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Why can I not Loop Cut my plane?
The yellow dots appear on the side... I just don't understand it.
I guess it can only be really understood with the blend file, so I have uploaded it here:
Loop cuts do not work on n-gons (polygons with more than 4 vertices).
When I switched to Vertex Selection Mode there were some vertices on the sides.
After I removed them using Dissolve Vertices, Loop Cutting worked as expected.