I think it may have been two updates ago, but for some reason Samsung has decided to change the flashlight shortcut on the lock screen to be activated by tapping it instead of swiping. Turning on the flashlight while the phone is in my pocket happens almost all of the time now. As far as I'm aware, no setting exists to change this back to "swipe to turn on". While I'm on this topic, would it be possible to utilize the lock button to turn the flashlight off? I've had a Xiaomi phone that did this by double clicking it and it's a small feature that I always forget doesn't work on my phone.
Running an S10 Lite on One UI 3.1 April Security Patch.