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I remember doing this on Reddit Sync years ago by combining this option,
Settings shortcut: History > Mark posts as read on scroll
With something like this option,
Settings shortcut: General > FAB action
Set the FAB to hide read posts. The main difference to how I had it working in the past is that with this, you must use the floating action button to periodically purge this content, where as I’m sure I had it working automatically before.
There was the occasion dark environment on old mario kart games that ticked all these boxes and I never had an issue with.