One of My ODTs Freezes LibreOffice. I had to Force-Close LO

LibreOffice: 7.4.7.2 40 (Build:2)
OS: Devuan GNU/Linux 5 (daedalus) Linux 6.1.0-27-amd64 x86_64

(The original title was “My .odt froze my Computer. I had to Press the Power Button”. That was true in late September but, for whatever reason, in November that is no longer true. Now the ODT in question freezes LO but the System stays alive)

I was adding internal links (Contents, etc.) to an existing document. It got to ~600 pages. Things seemed OK & I was trying to add a Contents listing, but without joy (but no error message, and a full Heading sequence from H1 to H4 was in place).

The following morning I loaded the .odt & after ~2 secs my whole computer froze solid. I had to use the power button to shut down.

I’ve loaded every file up to Github, both ODT + PDFs.

Does anyone have the tools to investigate why this LO writer file does this? I’m at a loss as what to do.

The raw files are at GitHub - alexkemp9/Python3docs: Creating a PDF Manual about Python v3 .

The very first step: reproduce bug using latest fresh/still version