`But` keyword causing error when running

When using the latest (3.7.5) version of CodeceptJS, an error is thrown whenever a gherkin scenario uses the `But` keyword.

![terminal output showing the error "this.ucfirst is not a function"](https://raw.githubusercontent.com/mozillalives/demo-keyword-issue/refs/heads/main/test-output.jpg)

I've created a small project to reproduce this issue.

https://github.com/mozillalives/demo-keyword-issue