Well the title pretty much sums it up. Opened the calc document I use every day, and on my main sheet all my comments have vanished. Other sheets are ok. As per the title I posted this exact problem 9 years ago (post) …seems like some bugs are resilient…a superbug, perhaps 
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I’ve been trying to make the swap from Excel for years…this kind of problem makes it impossible. Gutted.
Version: 7.6.5.2 (X86_64) / LibreOffice Community
Build ID: 60(Build:2) / Linux
Can you explain the intentions behind this post?
In order to fix a bug, the developer must understand under what conditions this bug occurs.
Try to remember and reproduce your actions that led to the disappearance of comments on one of the sheets.
I can assume that the comments were deleted after inadvertently executing a menu item
Menu / Sheet / Cell Comments / Delete All Comments
or equivalent keystrokes (this menu item is only visible if there is at least one comment on the sheet).
In my opinion, it is worth writing to Bugzilla that group deletion of comments should be done only after confirmation of this operation by the user.
@Lupp Answer “yes” to your first 3 bullet points…“no” to the last 2. I wont bother asking what your intentions were.
@sokol92 I only found the “Delete All Comments” option when I starting searching for a clue as to what had happened…didn’t even know it was there so pretty sure that’s not how it occurred. Also there’s no hotkey combination to activate it which makes it seem pretty unlikely.
As for the conditions that led to the disappearance, I saved the spreadsheet last night, it had comments. I opened it up this morning and the comments were gone. Fortunately I back up every week so only a weeks worth of comments lost. I’ll be backing up daily from now on - my bad.
I will file a bug report and follow your suggestion re requirement of confirmation before mass deletion of comments.
He actualizado a la version 7.6.5.2 y, si bien veo los comentarios, no puedo crear nuevos. Aparece la ventana amarilla pero no puedo escribir texto.
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===Edited by @Lupp 2024-03-18 about 18:45 UTC===
By courtesy a translation to English gotten by DeepL.com:
I have upgraded to version 7.6.5.2 and, although I see the comments,
I cannot create new ones. The yellow window appears but I can’t write any text.
…
Please note:
In this section of the forum, messages are posted in English.
Please provide information about the version (Menu / Help / About).
Hello,
This has just happened to me. First, I noticed that there where two versions of the comment I was editing pointing to the same cell. I copied the content of the cell and closed calc, when I opened again all of the comments where gone.
This has happend to me several times, and I have always been able to restore a previous version.
I am completely sure that I have not selected anything like “delete all comments”… Some of them have survived. I opened the file some months ago with onlyoffice, and the comments were somehow unformatted, all line feeds lost. That was not much of an issue… Since june I have deleted and recreated some comments (one per week). Now, only the new comments have dissapeared. The unformatted ones are still there.
Version 25.2.6.2 (X86_64) / Libreoffice Community
Running on Arch linux, last system upgrade october 25.
As @redart said, this seems to be a very resilient bug. I don’t know how to proceed from here, and if I can provide any additional information in order to chase it.
Update - I have opened it again and I have found that the “bad version” of the comment (one of the two I mentioned in the first paragraph) is still there, with two arrows pointing nowhere. It should be attached to the selected cell.
