I have 86 links for my site
example.com successfully indexed by Google Search Console. They first appeared in Google's search results. But after a few days, most of the links disappeared. Currently, only 13 links are shown in search results when pointing to site:example.com
I know searching using "site:xxx.com" is not reliable. I tried to manually search (using keywords and phrases) for those links reported indexed but not shown in search results, and yes, they could not be found. I can confirm this because the search results showed the links in my old website.
Am I being penalized by Google for doing something wrong?