Seagrass texture glitch

Whilst exploring my world trying to find a mangrove swamp, I noticed that some of the seagrass in the river next to me looked weird, where the top of the water was replaced with seagrass texture. It was right where the shore was in one block tall water. I know a similar bug occurred in the 1.14 update, so I assume it should be easy. Thank you for your time.