Created attachment 159093 [details]
DOCX with tables doesn't look good.
Never was fine. Actually better around 5.2.
May be a duplicate but I cannot find.
Created attachment 159094 [details]
Sample compared MSO 2013 LO 7.0+
Confirmed on windows 10 x64 with Version: 184.108.40.206 (x64)
Build ID: dd0751754f11728f69b42ee2af66670068624673
CPU threads: 12; OS: Windows 10.0; UI render: default; VCL: win
Also the header from the 1st page is copied to a 2nd page, which doesn't exists in Word.
Created attachment 167709 [details]
There seem to be some floating tables in here, the red part of the document seem to be two 1 cell large floating tables, embedded in a third (this is only visible after dragging them out a bit in Word).
The "Totale optional" normal table seems to get merged with these when opened in Writer.
Yet when this reduced file is opened in Writer, it sees 5 tables, all merged into one floating frame.
Created attachment 167710 [details]
The minimized docx example file in Word and Writer