that’s broken glass, when you step on it it makes noise that can alarm nearby enemies and make them investigate the source of the noise
There is a note in the cloudy room, next to the levitating door, that contains a hint/tip on what to do in the corn fields. Check it out again and see if it helps ;) If you still struggle, I will tell you the solution to the puzzle in the next spoiler tag.
Follow the gaze of the scarecrow. If the scarecrow looks to the right, take the first right exit; if it looks to the left, take the first left exit; and if it looks down, go with the middle. At the end, you will receive the key from the scarecrow that will allow you to progress and get to the ID card ;)
Welp, that’s it, good luck, and if you need more help just let us know ;)
