I was chaining Ralts, and at the start of the chaining adventure, I started with a gently shaking grass. I was on my 43rd chain, and got tired a lil so I walked to a vigorously shaking grass (dw I got save states) and...not break the chain? To be fair the encounter from the vigorously shaking grass is a Ralts too but doesn't walking to a different type of grass supposed to break your chain?
Update: It happened multiple times.