Environment- beta, test2
1> insert a table.By default it is 4x4.
2> Highlight only the content cells under the first two header and merge them. Do the same for the other two columns. It is now a 2 x 4 table.
3> Select the last header cell and insert after or click on the first header cell and insert before.
JS error “Uncaught TypeError: Cannot read property 'isPlaceholder' of null” appears.