If you shoot with a micro 4/3 camera such as a Panasonic or Olympus, you should note that lens corrections are applied automatically without your intervention. The same is true of some other cameras, including Leica Q, Fuji X, Sony and a collection of point-and-shoot cameras from Canon.
The lens correction profile is written into the Raw file by the camera. This information is then picked up by Lightroom and applied to the image automatically. You can find out if a lens correction profile has been applied automatically by clicking on the information icon within the lens correction tab.
Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"
It's absolutely never happened before this update. I use a fisheye almost exclusively as I shoot entirely underwater, with large predators. This is a giant pain in the ass. Gonna have to figure out a way to remove the update.
Unless you're using a camera that writes lens corrections to the raw files in a way that enables Lightroom to apply them automatically, this shouldn't be happening. Nikon Z and Fuji GFX cameras also have this feature (with native lenses).
Check that you aren't applying a preset on import that includes lens corrections.