I've lost the ability to create tests for a class

Since I have updated to 2024.2.3 of Intellij Ultimate, I am not able to create tests using the “create test” option. Although the intention is still enabled, “create test” is not in the pop-up menu when a class is selected (the only option is “Show UML Diagram”). Everything was working until the update, and it's the same in every repository.

If I use Navigate:Test or the keyboard shortcut, I get an error that says “No test subjects found” even though the Class name is highlighted. If a test already exists, it will navigate to that test. I just can't use any automation to create a new test (like I've been doing for years).

Is there something I can check to fix this?