[Bug] New app's thumbnail is not loaded if image is replaced inline (without changing its URL)

[nursoda]

This issue initially was opened as nextcloud/server#34151 and has been moved here. It may be related to nextcloud/appstore#891 and nextcloud/appstore#361.

Bug description

I have this line in my app's appinfo/info.xml:

<screenshot small-thumbnail="https://raw.githubusercontent.com/nursoda/twofactor_email/main/screenshots/select-auth_thumb.png">https://raw.githubusercontent.com/nursoda/twofactor_email/main/screenshots/challenge.png</screenshot>

I replaced that screenshot image on GitHub two weeks ago. In the app store, the new screenshots and thumbnails are displayed:

Not so in /settings/apps App's Details – there, the old image remains:

Clearing cache and reloading does not solve it.

Steps to reproduce

1. Create a NC app, do screenshots, link them with a static URL in info.xml, publish the app in the NC app store. Install the app in a NC instance. Check that images are shown in app store and NC instance.
2. Change screenshots and upload them to the SAME static URL. Check the app's details page in the store: new images are shown. Check in the NC instance: old image remains.

Expected behavior

The new thumbnails should be displayed in /settings/apps aswell.

[edward-ly]

I finally figured out that this is an issue with the proxy behind the app store rather than the app store itself, so now this issue should be in the correct repo.