Unable to select dates earlier than the current date.

[806software]

Ionic version: (check one with "x")
[ ] 2.x
[ ] 3.x
[ ] 4.x
[x] 5.x

Ion2-calendar mode: (check one with "x")
[ ] components mode
[x ] modal mode

I'm submitting a ... (check one with "x")
[x ] bug report
[ ] feature request
[ ] help me

Current behavior:

Configuring a modal I am unable to select any date before the current date.

Expected behavior:

I should be able to select dates earlier than the current date

Steps to reproduce:

Create a modal and present. Dates before the current date are greyed out and not selectable. Cannot move backwards.
I have tried setting the to, from and defaultDate options, but none have any impact - hence omitting them below as it gives the same result.

Related code:

const options: CalendarModalOptions = {
      title: 'Select date',
      color: 'primary',
      pickMode: 'single',
      closeIcon: false,
      closeLabel: '',
      doneLabel: 'Set date',
};

const modal = await this.modalController.create({
      component: CalendarModal,
      componentProps: options
 });

await modal.present();

Other information:

Ionic info: (run ionic info from a terminal/cmd prompt and paste output below):

Ionic:

   Ionic CLI                     : 6.16.1 (/Users/jasonmcclean/n_local/lib/node_modules/@ionic/cli)
   Ionic Framework               : @ionic/angular 5.6.7
   @angular-devkit/build-angular : 12.0.1
   @angular-devkit/schematics    : 12.0.1
   @angular/cli                  : 12.0.1
   @ionic/angular-toolkit        : 4.0.0

Utility:

   cordova-res : not installed globally
   native-run  : not installed globally

System:

   NodeJS : v14.17.0 (/Users/jasonmcclean/n_local/bin/node)
   npm    : 6.14.13
   OS     : macOS Big Sur

As can be seen below, everything before the current date (29th June 2021), is not selectable. I have used this component on several projects (prior to Ionic 5), with no issues.

[806software]

I've worked around it by creating a separate modal and using the calendar component within that modal instead. That appears to work fine.