Resolution: Cannot Reproduce
Minecraft 1.13.2, Minecraft 19w02a, Minecraft 19w07a, Minecraft 19w08b, Minecraft 19w12b, Minecraft 19w13b, Minecraft 19w14a, Minecraft 19w14b, 1.14.4, 1.15.1, 1.15.2 Pre-Release 1
Water drips occur from leaves in snow biomes.
How to reproduce
Head towards a wooded mountains biome and turn on rain/downfall at around y=115.
Though this is somewhat of a duplicate of
MC-29796, it now reoccurs in recent versions (1.13.1>), whereas before it did not after the resolution of MC-29796.