Created attachment 153469 [details]
Files used in the test
Probably it's not a big problem since appearly it has no negative effect, but it's visually unpleasant and perhaps it can create real problem in more complex documents.
I can confirm this.
As you can see in sidebar this frame indicates a section section, that is added, when you open the file in LO
Version: 22.214.171.124.alpha0+ (x64)
Build ID: 3e64065612acec2eb29aa21e2b515953422256d7
CPU threads: 4; OS: Windows 10.0; UI render: GL; VCL: win;
TinderBox: Win-x86_64@62-TDF, Branch:master, Time: 2019-08-15_22:57:26
Locale: de-DE (de_DE); UI-Language: en-US
Version: 126.96.36.199 (x64)
CPU-Threads: 4; BS: Windows 6.19; UI-Render: GL;
Gebietsschema: de-DE (de_DE); Calc: group
Writer doesn't have the concept of a continuous break, so it has to emulate that with sections. Word combines page styles and section settings into a single concept, but writer has them distinctly separated. Since the emulation is working without a negative effect, I'm marking this as won't fix. This is an EXTREMELY tricky area to deal with and has lots of bug reports. (see bug 81426 for example.)