Customize Component Rendering throws 'specialDay' error in storybook

Check that this is really a bug

• I confirm

Reproduction link

https://bigcalendar.github.io/react-big-calendar/?path=/story/examples--example-8

Bug description

When switching to another view in this storybook, you get the error:

Cannot read properties of undefined (reading 'specialDay')

Expected Behavior

Able to see other views

Actual Behavior

Cannot read properties of undefined (reading 'specialDay')

react-big-calendar version

1.20.0

React version

19.2.6

Platform/Target and Browser Versions

Windows

Validations

• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.
• Make sure this is a react-big-calendar issue and not an implementation issue

Would you like to open a PR for this bug?

• I'm willing to open a PR