I've done a ressource pack to show the age of sugar cane by showing a different texture for every stages, but sometimes the age of the sugar cane is not updated correctly, you have to update it manualy by right-clicking the block.

how to reproduce:

use my ressource pack (MC-135829.zip), put some sugar cane and wait for it to grow, then right-click some and see them updating

I'm aware that the fix of this could possibly lag clients because of many updates of leaves and kelp, so for avoiding lag maybe the client could check if a state show a different model then ask the server for the state, or redraw the chunk only if it's the case ?

here some screenshot before and after a right-click, you can see the age updated despite my randomTickSpeed at 0