This bug is a parity issue. When you use any type of pickaxes to break pointed dripstones, it doesn't speed up the breaking process.
How to Reproduce
1. Place down some pointed dripstones
2. Take any type of pickaxes.
3. Break the pointed dripstones.
The pointed dripstones doesn't break faster regardless of any type of pickaxes.
It should break faster when you have better pickaxes (netherite > wood)