What are these wall materials with 0 sq. m. area which sometimes appear in the building element report and sometimes cause a "too many walls and doors" error?

These are usually caused by stacked nodes.  

 

See also:

How do stacked nodes happen?

How can stacked nodes can be located?

What impact do stacked nodes have on a rating and its accuracy?

How can stacked nodes can be removed (without redrawing zones - that creates other problems like identifying zones connected by stairs)?

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