Image thumbnail attached in Confluence page blur after saving the page.

STEPS TO REPLICATE

1. Create/Edit a page in Confluence.
2. Attach an image into the page.
3. Save the page.

EXPECTED BEHAVIOUR
The image thumbnail will display correctly.

ACTUAL BEHAVIOUR
The image thumbnail display a blur image.

NOTE
The image display correctly in the preview when user click on the thumbnail.

WORKAROUND
When attaching the image, the image size will automatically set to medium. To workaround the issue, kindly:

1. Resize the image to Large before savin the page.
   OR if you want to keep the Medium image size:
2. Edit the page.
3. Resize the image to Large and back to Medium
4. Save the page.