This behavior causes lush caves to eventually become overgrown with cave vines, which look ugly. It also causes excess block updates which causes a lot of lag. The same thing happened with kelp back in 1.13.

The report for kelp was MC-162905. It was fixed by limiting the age kelp can generate with to 20-23, instead of 0-25, which significantly reduces the number of block updates and prevents all kelp from becoming overgrown and reach the ocean surface. The same treatment should be applied to cave vines.

Expected Result

The cave vines would generate between an age of 20-23 to decrease block updates which would reduce lag