LO crash, unsuccessful recovery despite autosave

Hello everyone,

I worked on a document between 10 AM and 1 PM today. While changing some headings in a pretty large document (50 pages but lots of headings) at 1 PM, LO Writer freezed and crashed. When restarting LO, it prompted the auto-recovery as expected, and the recovery “succeded”. But it actually didn’t : the document actually reverted to its last “manual save” state, even though it autosaved multiple times afterwards.

What happened there ? What kind of info/logs can I give you to try to understand the issue ?

OS : Linux Mint 22.2
Version: 25.8.3.2 (X86_64) / LibreOffice Community
Build ID: 580(Build:2)
CPU threads: 16; OS: Linux 6.8; UI render: default; VCL: gtk3
Locale: fr-FR (en_GB.UTF-8); UI: en-GB
Ubuntu package version: 4:25.8.3~rc2-0ubuntu0.24.04.1~lo1
Calc: threaded