Created attachment 135909 [details]
Example file

nf did not work for me, so here is a test file.

Reproduced.

Arch Linux 64-bit, KDE Plasma 5
Version: 6.0.0.0.alpha0+
Build ID: 4082b5874adddedf8332fe977b6bb47b6949b302
CPU threads: 8; OS: Linux 4.12; UI render: default; VCL: kde4; 
Locale: fi-FI (fi_FI.UTF-8); Calc: group
Built on August 31st 2017

Arch Linux 64-bit
LibreOffice 3.3.0 
OOO330m19 (Build:6)
tag libreoffice-3.3.0.4

This bug is still present in 6.0.5.

It also present in 6.1.1.1.

*** Bug 128485 has been marked as a duplicate of this bug. ***

*** Bug 143230 has been marked as a duplicate of this bug. ***

(In reply to Buovjaga from comment #1)
> nf did not work for me, so here is a test file.

I'm able to repro with the test file, but how did you insert the Formula?  I tried Insert->Field->More Fields..., but it doesn't insert the same type of Formula as in the test file and doesn't repro.

(In reply to Matt K from comment #7)
> (In reply to Buovjaga from comment #1)
> > nf did not work for me, so here is a test file.
> 
> I'm able to repro with the test file, but how did you insert the Formula?  I
> tried Insert->Field->More Fields..., but it doesn't insert the same type of
> Formula as in the test file and doesn't repro.

Try Insert - OLE Object - Formula Object.

Still repro observations from comment 0 except now there is an indication the object was deleted.

Version: 7.6.4.1 (X86_64) / LibreOffice Community
Build ID: 60(Build:1)
CPU threads: 8; OS: Linux 6.6; UI render: default; VCL: kf5 (cairo+xcb)
Locale: fi-FI (fi_FI.UTF-8); UI: en-US
7.6.4-1
Calc: threaded

I was able to prevent the original formula from being lost on save by doing the following comment in the code of SwRangeRedline::Hide:

//case 2: DelCopyOfSection(nMyPos); break;

But the code still inserts a new Formula object and marks it deleted, so it seems like the original code is doing a delete then insert but I didn't find where yet.

Points of interest in the code:
- I bibisected the code change for "Mark image as deleted in track changes" to d845b91bcc6eb885c55494d4d4fab4ec09577e1d
- embobj.dll!DocumentHolder::CloseDocument
- smlo.dll!SmDocShell::Save

Dear Frederic Parrenin,

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MassPing-UntouchedBug