Apple just made a little fix for the newest versions of iOS 18 and iPadOS 18, which are still being tested.
The fix is called an update and it's like patching a hole in your favorite toy so it works better.
Apple didn't say exactly what was broken, but it was important enough to fix quickly.
These beta versions are like tryouts before the real software comes out, and Apple wants to make sure everything is perfect for everyone to use.