workers have always been able to build roads in your empire if you have open borders (you want them to do that, better trade route income!) but they should never be building improvements. I would report this as a bug.
I had that problem on my 1st BTS game, then checked the "automated workers leave old improvements" thingy and no more ai worker terrorism. Try it should work for you too hopefuly And as everyone has stated, yea you always been able to build roads/railroads on rivals terrirtory and since bts you can do forts as well.
Maybe that's a buggy. I have had AI workers start to build a plantation or another improvement that I swallowed culturally and they kept working until the improvement was completed.
"When I come back no more Mr. Nice Guy." Adolf Hitler
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