If you visit the website https://www.deutschlandfunk.de/ (or https://www.deutschlandfunkkultur.de/) with Safari and browse for a while inside that domain (duration is not fixed neither the amount of visited pages), images are not loaded any more (unless they are already in cache). It seems to be necessairy to use the back button while browsing to trigger that behaviour.
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This issue occurs using the Safari browser on Mac as well as on IPhones and IPads.
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On iOS it affects Firefox and Chrome too.
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As soon as the issue occurs, any new image (e.g. image is not in cache storage) will not be shown.
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"A while" can be a few hours. We were not able to find out any event that might be causing this issue.
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Cached Images will be shown. Using the inspector you can see, that the browser tries to load the images, but nothing happens. There is no error or warning. It seems, that the request is not fired at all.
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Copying the URL of an unloaded image to another browser tab does not load the image neither. Using another browser (on Mac system) loads the image in the other browser.
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The issue is reproduceable using the incognito/private mode too.
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It seems to be related to the browser session. It works in a newly opened window in private mode or after closing and reopening the browser again, as well in other browsers or with curl on the command line.
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It is not related to JavaScript, we disabled JavaScript in Safari and the issue was still reproducible.
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Once the browser is in this state, there is no way to load any images from nor do any requests (even for non existent resources) to assets.deutschlandfunk.de or assets.deuschlandfunkkultur.de until restarting it.
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Clearing cache, cookies does not help, even after a waking the system up after a few days in sleep mode does not change anything
Thank you!