Podcast episodes "unplayed" filter not working

For a long while now, my “Unplayed” filter for podcasts is not working at all. Podcast episodes are not always marked automatically as watched, and even when they are, then don’t get filtered as such.
Here is a screenshot
It’s annoying and would have been okay if fixed after a few weeks/months but it’s bothering me now.
Any suggestions ?
Thanks in advance,

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