Mining pointed dripstone in Survival mode makes the dripstone darker

When I mine pointed dripstone in Survival mode, it makes the dripstone appear darker.

Steps to Replicate
1. Go into Survival mode.
2. Begin to mine Pointed Dripstone.

Expected Result
A normal breaking texture will appear and it will break as normal.

Actual Result
The dripstone turns very dark brown, almost black.

Conclusion
I recently signed up for Beta Minecraft to get Caves and Cliffs features in advance. Upon playing I noticed this bug. A screenshot is attached. Thank you for reading this.