Created attachment 154258 [details]
A DOCX with a text frame
Opening the attachment in LO produces a set of several overlapping frames, the result is unreadable.
Tested with Version: 18.104.22.168 (x64)
Build ID: db810050ff08fd4774137f693d5a01d22f324dfd
CPU threads: 12; OS: Windows 10.0; UI render: GL; VCL: win;
Locale: ru-RU (ru_RU); UI-Language: en-US
Created attachment 154260 [details]
Comparison LO to Word
I confirm it with
Version: 22.214.171.124.alpha0+ (x64)
Build ID: f0c832acb53326ccc9a8c1a47401fbc9e1081feb
CPU threads: 4; OS: Windows 10.0; UI render: GL; VCL: win;
TinderBox: Win-x86_64@62-TDF, Branch:master, Time: 2019-09-11_05:46:53
Locale: de-DE (de_DE); UI-Language: en-US
and also with
Version: 126.96.36.199 (x64)
CPU-Threads: 4; BS: Windows 6.19; UI-Render: GL;
Gebietsschema: de-DE (de_DE); Calc: group
The text in the frame has several paragraphs and they have different paragraph styles set. This seems to be the basis of breaking up the frame, a very interesting solution to handle the situation.
Setting the frames paragraphs to the same style in Word makes the frame split go away in Word.
Then it is possible to set different paragraph styles to the frames paragraphs and to export that as one frame to docx which then stays one frame after reopen both in Word and Writer.