The formatting(font size) of a line break is changed to the document default after adding a single paragraph before the line break. However, the current span style will be changed to the default formatting after adding several paragraphs with a text before a line break. This results in adding the next paragraphs with document default formatting instead of the current span style. The problem is reproducable only in flow mode.
Note: the document default style formatting should be different from the formatting of the line breaks.