Formatting some text as two columns forces fillowing one column onto a new page

I start with a document with text all in one column. I need some text in the middle of the document to be two columns. I select it and choose Insert → Insert Section, setting the section options for two columns (no other changes to section settings are made). When I click the Insert button, the selected text is formatted as two columns as desired. However, the following, one column text is forced onto a new page despite there being plenty of room on the previous page for the text.

Writer is inserting a soft page break at the first one column text paragraph after the two column text. (I saved a version of the file in fodt and used a text editor to see what was going on: I found “text:soft-page-break/” there.) I have tried fiddling with text flow options for this paragraph and for the last paragraph of the two column text to see if I can get rid of the soft page break, with no luck. (There is no way to directly deleted a soft page break, unlike a hard page break.)

How do I get rid of the soft page break?

Attached are two files: Example1_1Section1Column.odt is the document with text all in one column. Example2_2Sections1-2-1Columns.odt is the document after some text has been formatted to two columns, clearing showing the problem.

I have also tried to format using Format → Columns instead of Insert → Insert Section, but the same behavior occurs.

I am using Default Page Style for my page styles. I am using paragraph styles, not direct formatting.

Example1_1Section1Column.odt (734.9 KB)
Example2_2Sections1-2-1Columns.odt (735.1 KB)

Edit section
Click on Options button
Select Columns tab
Untick Evenly distribute contents to all columns