That is a missing feature. Only for custom shapes a wrap polygon is created and that one is bad. The relevant part is in docxsdrexport.cxx, starting in line 1092. In addition interpretation of text::WrapTextMode_LEFT and text::WrapTextMode:Right is missing. I have already started to work on it, so I would like to take it. But I'm not working full time on LibreOffice, so I need some time. Do you need a quick solution?

I'll work on it and fix it together with the other wrap problems in DocxSdrExport::startDMLAnchorInline.

Created attachment 175062 [details]
The example file and its docx version in current master

The contour wrap seems to be exported correctly now in:

Version: 7.3.0.0.alpha0+ (x64) / LibreOffice Community
Build ID: 80a47aae1419842f4496f02028e2b49763aea25b
CPU threads: 4; OS: Windows 10.0 Build 18363; UI render: default; VCL: win
Locale: hu-HU (hu_HU); UI: en-US
Calc: CL

after:
commit 61ef73bb9e06ac7325abc26698314d7e35c164cc	[log]
author	Regina Henschel <rb.henschel@t-online.de>	Sun Aug 08 01:05:09 2021 +0200
committer	Miklos Vajna <vmiklos@collabora.com>	Fri Aug 13 16:00:35 2021 +0200

tdf#143432 and more, improve wrap contour export

Created attachment 175063 [details]
The exported docx in Writer and Word

However it is still not good in Word:
- Writer sees the grouped shape as Optimal wrap with Contour enabled
- Word sees it as Through wrap instead of Tight

Created attachment 175064 [details]
The example file saved by Writer

The relevant part seems to be this in document.xml:

								<wp:wrapThrough wrapText="largest">
									<wp:wrapPolygon edited="0">
										<wp:start x="0"
        											y="0"/>
										<wp:lineTo x="21600"
         											y="0"/>
										<wp:lineTo x="21600"
         											y="21600"/>
										<wp:lineTo x="0"
         											y="21600"/>
										<wp:lineTo x="0"
         											y="0"/>
									</wp:wrapPolygon>
								</wp:wrapThrough>

Created attachment 175065 [details]
The previous example fixed up in Word 2019

After manually fixing it in Word and saving, the relevant looking part in document.xml:

								<wp:wrapTight wrapText="largest">
									<wp:wrapPolygon edited="0">
										<wp:start x="10740"
        											y="0"/>
										<wp:lineTo x="10740"
         											y="7144"/>
										<wp:lineTo x="0"
         											y="8288"/>
										<wp:lineTo x="0"
         											y="14432"/>
										<wp:lineTo x="10502"
         											y="16289"/>
										<wp:lineTo x="10502"
         											y="21433"/>
										<wp:lineTo x="19571"
         											y="21433"/>
										<wp:lineTo x="19571"
         											y="4858"/>
										<wp:lineTo x="21003"
         											y="1143"/>
										<wp:lineTo x="20765"
         											y="0"/>
										<wp:lineTo x="10740"
         											y="0"/>
									</wp:wrapPolygon>
								</wp:wrapTight>

Dear Regina,
bug has been in ASSIGNED status for more than 3 months without any
activity. Resetting it to NEW.
Please assign it back to yourself if you're still working on this.