Description:
The test is easy to design: create a new writer document, insert chapters with subchapters, export it as epub and then read it in any epub reader. bye.

Steps to Reproduce:
1.create a new writer document, 
2.insert chapters with subchapters, 
3.export it as epub 
4.read it in any epub reader

Actual Results:
the table of contents has just Chapters title (i.e. Title 1 style), no sub-chapters, sub-sub-chapters (Title 2, Title 3...)

Expected Results:
to generate a table of contents using all titles not only Title 1 


Reproducible: Always


User Profile Reset: Yes



Additional Info:
[Information automatically included from LibreOffice]
Locale: it
Module: TextDocument
[Information guessed from browser]
OS: Microsoft Windows 10 Enterprise LTSC (10.0.17763 N/D build 17763)
OS is 64bit: yes

Version: 7.1.0.0.beta1 (x64)
Build ID: 828a45a14a0b954e0e539f5a9a10ca31c81d8f53
CPU threads: 8; OS: Windows 10.0 Build 17763; UI render: Skia/Raster; VCL: win
Locale: it-IT (it_IT); UI: it-IT
Calc: threaded