The Bug:

Cauldrons fill up with water and powder snow despite carpet being placed above them.

Steps to Reproduce:

1. Summon a large area of cauldrons with some carpets above them by using the commands provided below.

   /fill ~1 ~ ~1 ~15 ~ ~15 minecraft:cauldron

   /fill ~1 ~1 ~1 ~15 ~1 ~15 minecraft:white_carpet

2. Set the weather to "rain" and wait for around two minutes.
3. Set the weather to "clear" and remove the carpets from on top of the cauldrons by using the command provided below.

   /fill ~1 ~1 ~1 ~15 ~1 ~15 minecraft:air

4. Look at the contents within the cauldrons.
5. Take note as to whether or not cauldrons fill up with water and powder snow despite carpet being placed above them.

Observed Behavior:

Cauldrons fill up with water and powder snow despite carpet being placed above them.

Expected Behavior:

Cauldrons would not fill up with water and powder snow if carpets have been placed above them.