XF 2.2 PNG Image Embedding Issue

A few weeks ago PNG image embedding stopped working on our threads/posts.

When we upload the images, they do go onto our server (so not a memory issue), and what ends up in the post is a URL to the image (linked to files on the forum).

Example:

Screenshot from 2024-01-20 20-03-28.webp

This occurs when using the typical "insert image" functionality:

Screenshot from 2024-01-20 20-06-22.webp

We weren't making any changes to the forum/server when this began happening.

We've tried:
  • increasing the pixel size
  • enabled image proxy
  • increased file size limits (shouldn't have been an issue, did it anyways)

We aren't seeing any errors thus far in the admin back-end or with the server.

And have made no progress thus far.

Other image types (e.g., JPG, JPEG, etc.) are embedding normally.

Is there anything else we can try?
 
To re-frame the question, I was looking through some add-ons, and found this one:

What our forum is currently doing is similar to the function of that add-on, except, we do not want it to do that.

Our forum is currently taking all PNG image attachments and automatically converting them to Attachment URLs
 
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