Corrupt File?

I have a file that i keep open most days (work purposes), it is only 111kb, although it is almost 30,000 words. I use it on Office 2016. These later versions of Word have that search panel where you can see each instance of your search result in context very quickly (a feature I use all the time). It has over a decade old, I've used it across a few laptop purchases (every 4-6 years), I forget how old it is, if that matters. I think in the past, I've saved it as an .ODT file, or even .RTF file, and then saved it as a .DOCX as it currently is.

The other day, I tried searching for something in the file, and Word didn't display anything in the search results panel. I tried it again, and the same thing happened. I closed out Word, and restarted it, and it showed me the results in that panel again.

I tried the Text Recovery (Recover Text from any File) option, but it got me more concerned. What word gave me was a file of 974 words, which is a bunch of random letters/numbers/non-alphanumeric characters---but nothing like the original file. When I first opened up this file with the Text Recovery function, Word did tell me that there were some corruptions in the file.

My concern is that I don't want to lose this data to a corrupt file. I would simply copy & paste the info as raw text into a new file, but I don't want to lose formatting (no HTML links, just bold print & larger font sizes).

(1) Is this file getting corrupted?

(2) If it is, is there a safe way to paste formatted text into a new file, that would not carry over a bunch of possible causes of corruption into the new file?

EDIT: I went ahead and followed the instructions for Method 1: Copy everything except the last paragraph mark to a new document, in this page: https://learn.microsoft.com/en-us/troubleshoot/microsoft-365-apps/word/damaged-documents-in-word?source=recommendations

The formatting that I wanted, was carried over, so that is good. Does that method do anything to remove corruptions? I'll start using the new file I created just now.