I would greatly appreciate it if you could record a video.
However, I want to explain a few things. Our system generates thumbnails using our own dedicated image servers that dynamically fetch images from the uploaders' links. These images are then downscaled into various sizes and converted into formats like AVIF or WebP, all on the fly, tailored to the user's device, capabilities, and resolution. This process uses significant CPU resources.
Once created, these images are cached in our hot cache for at least seven days. If another user with similar device capabilities requests a thumbnail, the server will retrieve it from the cache rather than regenerating it, resulting in much faster load times.
This entire process is fully automated. It’s important to note that all thumbnails and previews on the home page, including in the tabs should be extensively cached, with all versions available, since they receive the highest traffic.
What you've described may suggest a bug; however, I check it several times daily and have not encountered this issue at all.