On select dates from Show Preview it adds the date to the Excluded frequencies

Current Situation
When editing the calendar from the resource tab and show a preview for the excluded frequencies and click on the dates and click on the close button the dates will add in the excluded frequencies.

How to Reproduce

• Click on the Resource tab
• Edit the calendar which has included and excluded frequencies
• Show preview for the excluded frequencies
• select some dates and close the window
• The selected dates are added in the excluded frequencies

Desired Behavior
On selecting the dates in the show preview option for the excluded frequencies the dates should not be added in the excluded frequencies.