Use of braceless arrow functions as function argument prevents "Method call arguments : Wrap always" to be applied

Here is my code style settings :

I expect this code :

b = iif(
  () => this.a === 'new',
  this.store.select(routerSelectors.selectQueryParam('parent')).pipe(),
  of(null)
);

to be in this format.

However, when I format the code, I get this :

b = iif(() => this.a === 'new', this.store.select(routerSelectors.selectQueryParam('parent')).pipe(), of(null));

BUT if I add braces to the arrow function, I get the proper formatting :

b = iif(
  () => {
    return this.a === 'new';
  },
  this.store.select(routerSelectors.selectQueryParam('parent')).pipe(),
  of(null)
);

Something prevents the wrapping of function arguments to be applied when one of these function argument is a braceless arrow function.
I couldn't see a relevant setting to fix this issue.

.editorconfig is not interfering with the settings, as disabling it has not effects.

Webstorm version : 2021.3.1