Question: Page breaks within a chapter

I see the line of the pagebreak in the editor, when I set a"page break" But then, in the compiled book - epub - there is no page break and everything flows together.
What do I miss?

Follow up please here[url]https://forum.literatureandlatte.com/t/bug-page-breaks-in-epub/93646/1]
this certainly doesn’t work as it should be.