Adobe Acrobat Reader DC: strange search results

Adobe Acrobat Reader DC keeps producing strange search results.

A few examples:

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Is it a bug?

Host OS: Windows 10.

Software version: 2020.009.20067.


In the search box, click on the settings icon and open extended search. You just need to open it - nothing else - and it will fix the search results.

Tested with Adobe Reader DC 2021.011.20039

Screenshot (German, sorry, maybe someone can replace it): Open extended search