while exploring found these rails
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This issue has always been there with abandoned mineshafts. The rails (and the ground they were on) were placed, and then a later section of the mineshaft was placed and the ground under the rails was removed without the rails being removed.
Worldgen doesn't cause block updates (which is what would be needed for these rails to notice the ground under them is now missing). The world would generate far too slowly if it did. This is also why caves that cut too close to rivers and oceans sometimes expose the sides of water blocks without causing them to start flowing. And it's also why you sometimes find the top halves of trees floating above ponds. I wouldn't be surprised if this is never fixed.
Thank you for your report 😃
We're tracking this issue in MC-125343, so this ticket is being resolved and linked as a duplicate.
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maybe this is a duplicate of MC-125343