Put the summary of the bug you're having here
What I expected to happen was...:
Dripstone[stalagmite]to be waterlogged by flowing water
What actually happened was...:
Dripstone acts as a full block which wouldn't let the water through
Steps to Reproduce:
1. Locate biome a dripstone cave
2. Search for pockets of water near stalagmites
3. Search for places where water & stalagmites meet
Works as Intended, flowing water can't waterlog anything.