In 1.19.4, releasing the sneak key when you are not moving or opening your inventory when you were not moving did not trigger sculk sensors. In 23w12a it does sometimes. I think what is causing this is that the distance you need to move for the game to detect you "taking a step" is a lot smaller than it was before, meaning if you sneak and release movement keys, even when you stop sneaking the tiny bit of momentum you have is now counted as walking when it wasn't before.

Here are things that I have noticed happen when you release your sneak key or open your inventory when sneaking

• Sensors get triggered
• Calibrated sensors set to 1 detect it, meaning that it thought you took a step.
• Shriekers near the sensor get activated
• Sometimes footstep sounds play, but I was having trouble consistently reproducing this.

This makes exploring ancient cities extremely difficult because you can't even open your inventory without triggering shriekers.

Steps to reproduce

1. Place a sculk sensor.
2. Sneak near it
3. Stop moving
4. Release your sneak key

-> The sensor detects you releasing your sneak key

Expected result

The Sensor does not detect you releasing your sneak key

Part II - Opening your inventory. This is caused by the same underlying bug, that stopping sneaking triggers sensors to detect you.

Steps to reproduce

1. Place a sculk sensor
2. Hold your sneak key
3. Sneak a little bit near it and then stop moving
4. Keep holding your sneak key and open your inventory

-> The sensor detects you opening your inventory

Expected result

The Sensor does not detect you opening your inventory