When raining, cauldrons fill up with water despite a carpet being placed on top of them.

Brief Description: 
When it's raining, cauldrons fill up with water despite a carpet being placed directly above it.

Steps to Reproduce:

1. Place some cauldrons.

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

2. Place some carpet directly above the cauldrons.

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

3. Turn on rain.

/weather rain 

4. After about 5 minutes, remove the carpets and some cauldrons will have filled up with water despite carpet being placed above them.

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

(The process of cauldrons filling up with water as of the result of rain, takes quite a while so I'd recommend setting up multiple cauldrons to speed up the process).

Observed Results:

The cauldron fills up with water.

Expected Results:

The cauldron should not fill up with water as a block is placed above it.

Screenshots/Videos:

I have attached four images showing the process of how to reproduce this bug.

Notes:

I've set up multiple cauldrons as reproducing this with only one can take quite a while.