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Created attachment 17077 [details]
correct image

https://meta.wikimedia.org/wiki/Help:Displaying_a_formula#Fractions.2C_matrices.2C_multilines

https://en.wikipedia.org/wiki/Help:Displaying_a_formula#Fractions.2C_matrices.2C_multilines

Arrays: {|c|c||c|} where || - 2lines
it's in Wikipedia if the settings "PNG images"
but if there "MathML with SVG or PNG"
then || shown as a single line

Created attachment 17078 [details]
incorrect image

This is actually a limitation of the MathML spec that only allows solid and dashed table lines (not double lines).