When the language is set to “Japanese” and keystrokes are made, Audacity freezes and does not accept any input.
Confirmed in Audacity 3.0.4, did not occur in Audacity 2.4.2.
It probably happens with Audacity 3.x.
It seems to happen when using Microsoft IME from Windows 10 version 2004 or later, so if I turn on the “Use previous versions of Microsoft IME” option in Windows, it will not freeze.
The OS is Windows 10 version 20H2 (build 19042.1165).