Cucumber Expressions are not recognized

I have enabled Cucumber support:

https://www.jetbrains.com/help/idea/2017.1/enabling-cucumber-support-in-project.html

This works as expected for regex based step implementations:

When(/^I have ([0-9]+) cucumbers?$/, (cucumberCount) => {
  // ...
});

But if I use cucumber expression syntax:

When('I have {cucumberCount:int} cucumber(s)', (cucumberCount) => {
  // ...
});

Then IDEA doesn't recognize the step when used in a .feature file.

I get no step suggestions or cmd+click to navigate to implementation.