Unexpected Thumbnail Behavior in SharePoint News Pages

Hi Airton,

We’ve noticed the exact same issue recently and it’s been quite frustrating. When you click Edit on a news post or a template, SharePoint now automatically replaces the thumbnail with the header image. This behaviour didn’t happen before, previously, you could have different images for the header and thumbnail without any problem.

Unfortunately, this automatic override links the thumbnail directly to the header image. Since the banner (header) and thumbnail have different aspect ratios and sizing, this causes thumbnails to appear incorrectly or even show as blank when shared via email or displayed in news web parts.

I’ve tried several workarounds, including those suggested by AI, but so far none have fully resolved the issue. 

AI mentioned you can automate the thumbnail reset using Power Automate. I have not tried this yet - also feel it might be a longshot.

Thanks for raising this, it’s good to know we’re not alone in experiencing it. Hopefully fixed soon

Best regards,