Some featured images showing as thumbnail size 150×150

Hi, some featured images on my older posts are displayed as thumbnails (150×150). My theme is Twenty Twenty.

Is there a way I can reset them all to display as usual size?

Troubleshooting completed

• Site, theme, and plugins all up-to-date.
• If I disable all plugins, the problem remains.
• I regenerated thumbnails and cleared the cache. Same issue.
• Changing the theme to Twenty Seventeen fixes the issue.

What works

The only way to fix it is for me to go through every post like this, download the featured image, re-upload it with a different file name, and apply it as the featured image. That fixes it, but it will be a slow process.

Thank you

Previous, now locked, support thread https://www.ads-software.com/support/topic/some-featured-images-showing-as-thumbnail-size-2/.

• This topic was modified 7 months, 1 week ago by karlrock.

The page I need help with: [log in to see the link]