Rain sometimes appears underground or only rains in curtian spots (Not affected by resource packs)

Minecraft Version: 20w18a
Minecraft Version ID: 20w18a
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 481134632 bytes (458 MB) / 1028571136 bytes (980 MB) up to 12871532544 bytes (12275 MB)
CPUs: 8
JVM Flags: 7 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx12G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
Launched Version: 20w18a
Backend library: LWJGL version 3.2.2 build 10
Backend API: GeForce GTX 960M/PCIe/SSE2 GL version 4.6.0 NVIDIA 445.87, NVIDIA Corporation
GL Caps: Using framebuffer using OpenGL 3.0
Using VBOs: Yes
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: vanilla, file/Faithful-1.16
Current Language: English (US)
CPU: 8x Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz