cannot save existing tables | WordPress.org

I cannot save existing tables. When I press Save, 3 dots flash permanently. Now I have created a new table with the same content. The new table can be saved. However, there is a new problem. Elements of the type unordered list are used in the table. The list icon is Disc. The table is displayed correctly and saving works. However, the unordered list is not transferred. After calling up the table, a numbering is displayed and not the disc. What can I do so that the table is saved with an unordered list?