Rain particles are not stopping and bouncing when hitting the highest y-level block in a given x/y co-ordinate, and instead continue to fall through blocks all the way to bedrock. Attached is an underground location at roughly y=11 with rain particles breaching the ceiling as if it were above ground. Another screenshot shows the rain particles descending through blocks in spectator view.
I have tried reloading chunks and leaving and re-entering the world, neither of which have fixed the issue. The world was created pre-1.16 snapshots and functioned as expected prior to this snapshot (20w17a).
Thank you for your report!
We're actually already tracking this issue in MC-179845, so I've resolved and linked this ticket as a duplicate.
That ticket has already been resolved as Fixed. The fix will arrive in the next version or is already included in the latest development version of the game, you can check the Fix Version/s field in that ticket to learn more.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki