Favicon - Error when choosing / cropping an image

[stfa76]

Hi,

Steps to reproduce (using either Firefox or Chrome, latest versions in both cases):

• WordPress 5.6 (Theme Twenty Fourteen 3.0)
• Go to change the favicon of your theme
• Select any image in the media library

Two issues happen from here:

• If your image is already 512x512px then nothing happens, you can not choose the image, you get stuck in the media library.
• If your image is not already a square one, you can crop it but when hitting "crop", an error shows up (and no issues appear in the debug console) => ​https://i.ibb.co/sgqhHsx/Word-Press-Favicon.jpg

I'm not sure if this issue is related to WordPress 5.6 or if it was already there before 5.6.
I'm also not sure if the theme might be related to this issue as I haven't tested other themes.

Thank you for your help.

BR,
Stephane.