This thread is resolved. Here is a description of the problem and solution.
Problem:
The client was experiencing issues with missing images on translated pages, which were visible on the default English page. The images were expected to be duplicated from the original page, but instead, they were missing.
Solution:
1. We asked the client if they were using a plugin to convert images from jpeg to avif format, as the images on the primary language page were loading in avif format, while on the translated page, they were in jpeg but broken.
2. We confirmed that the ShortPixel Image Optimizer plugin used by the client is compatible with WPML, as indicated on our documentation page. We recommended reviewing the plugin settings to check for any options that might cause the images to break on the translated page.
3. We advised the client to back up their website and perform a conflict test following the instructions on our conflict test documentation.
4. The client resolved the issue by finding the missing images in the media library and restoring the backups taken by ShortPixel, which made all images available in jpg format again.
If the solution provided here is not relevant to your case, either because it's outdated or not applicable, we recommend opening a new support ticket. We also highly recommend checking related known issues on our known issues page, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If you need further assistance, please visit our support forum.
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