When it's raining, the rain goes through every block, even trough multiple layers. It even goes into the void
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Did you open the world in any 1.14 snapshot?

No, i didn't.
I assume you played your world in 1.13.2 though. If you backed up your world before upgrading it to 1.14, can you please attach it to the ticket? (If the file size is too large, please upload it somewhere else and then link to it here.) You can open the backups folder by going to Singleplayer → Select one of the worlds → Edit → Open Backups Folder.
To fix the issues with your world, please try the steps as described in MC-142134 to optimize it.

Please check if that's still an issue for you in the latest 1.15.2 stable release or the latest 1.16 development snapshot.

Hello,
In 20w19a, rain shows up inside houses and caves (see 2020-05-10_15.05.10.png).
Maybe linked to MC-139017 since we upgraded our world many times.
The issue in the 1.16 snapshots is MC-179845. Please see that ticket of help.
Since we haven't heard of this issue ever since 1.14.4, I'm going to close it as cannot reproduce.

My world was made in 1.15 but it is a problem in 1.16. It's like the clouds become one with the build after they touch. I linked my video of how it works on my world but file size to big and can't fully show where it starts and stops without video
