Hey,
This ticket can be closed now. We don't have too much traffic at the moment and we haven't noticed this issue again. We can ask for your guidance again in the future should we face the same issue again. Thank you all

In T422872#11808793, @Reedy wrote:

Do you know what stats of thumbnail vs original you’re requesting?

Generally, thumbnails are definitely preferred, so if you’re preferring original because it’s first match, that will start to explain your issues.

And you can actually request certain thumbnail sizes even if not presented to you via that API call.

Some of them will end up being generated, but many should be cached, especially for standard sizes if you’re picking used images.

In T422872#11806792, @Reedy wrote:

By you extract one of the links... What do you mean?

Are you always getting thumbs? Or are you sometimes (often?) requesting the originals based on size?

Hi, which exact type of "API keys" is this about?