I have noticed the following (potential) bug:
1. Use Ctrl+F to open search
2. If the current language is not the language of the document I use Ctrl+Shift (that's the key combination I use for changing input language)
3. When I start typing in the search box Adobe Acrobat crashes.
If I change the language before opening search, the program behaves as expected.

System info: Windows 10, 64-bit
Dell laptop, 16GB of memory
Windows language: Greek