Very odd. I've been playing with this, It looks like the text intensity drops slightly as the bottom of the post card (or rather its shadow) leaves the screen [or maybe that's not the trigger, more testing needed]. I'm perplexed, but will investigate. Thanks for reporting this!
I’m not seeing this, I do notice that the bookmark indicator sometimes becomes outlined rather than filled, but going back to my bookmarks it’s still there.
If other people are seeing this please comment in this post which I have now bookmarked to come back to!
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