Sulfur cubes don't despawn naturally, causing extreme lag in active areas

I'm in a Realms were has a Sulfur Cave next them, before 26.40, the game runs normaly, but after update, the game started run horible at our village, like a lag or a tick delay.

I coppied the world, setted my gamemode to Spectator and searched below of the village and I found this (attachment), the high generation of Sulfur Cubes made a extreme lag in entire Realm.