Fresh to me, anyhow. Don't recall seeing this mentioned on the forums before, so...
Many of us have said plenty already about how this thing is pretty weird and even really wrong-seeming for games on the largest maps. I learned about the "feature" by posting a question as weird as "can you have too many economic resource mines" or something to that effect.
It was disorienting, but I adapted and developed some sympathy for the idea that a civ might become distressed if it simply socked away too many resources. So I got in the habit of making the end of every turn in a mid-to-late game a spending spree to ensure I was under 20k.
Then, after diligently spending many, many clicks to drop to 19,5-something, I had the great "good" luck to have a surveyor on auto-pilot score some BC for the home hive. Trouble is, that lousy 500 BC cost me about 5,000 BC of normal revenue!
Here's hoping that the 2.0 effort includes enough time to both make this limit vary by map settings and apply to the treasury *before* you hit the turn button, not whatever happens to the treasury during turn processing.
And before anyone talks about how you can muck with things before the computer turns start, I've had too many crashes, messes, etc., in that context and it is just a silly idea even though it is sort of technically possible.