Backdated items added after I mark a feed as read, are marked read as well

In the podcast of Dutch radio station Radio 1 (http://www.radio1.nl/items.rss), items are sometimes added backdated. That means: they publish a item later than the pubDate in the item. When I mark this feed as read, items that are added later (but with a backdated pubDate, before I marked as read) are marked read as well. But I haven’t seen them yet.

For example: a item with 1PM (as pubDate) is added at 4PM. When I mark the feed read at 3PM, the 1PM-item (that is added at 4PM) will be marked read too. But I haven’t read/seen that item yet. Is there a possibility to change that?

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