As can be seen, the tall grass, pink petals, and cherry blossom leaves are not affected by Antialiasing, but the rest of the surrounding blocks such as the grass, shroomlight, etc are affected

Additionally, the antialiasing on the player's hand only seems to half work, as the edges of the hand model are antialiased, but the textures on the hand itself are not

The antialiasing setting is set to 16x in this screenshot