Recently, while building a page with SharePoint Modern, I noticed I am not able to use the automatic size for Document Library web part. After selecting it and hitting apply, the changes are visible, but if I go back to edit the web part or publish the page, that web part won't maintain the automatic size selection, it revert back to 'Medium - about 15 items' (default size).
Changing to Automatic size, applying (off screen) and going back to edit it again, it goes back to Medium size:
Selecting other sizes which are not the automatic ('Small - about 5 items' and 'Large - about 30 items') will work fine and maintain the size, but only not the automatic. I tried the same on other Site and it's having the same behavior.
