Only static rain available?

Granted, I haven't really tested this extensively, but I noticed that in the original UmiTweak patch for the pre-MG release of the game, the rain was actually animated. However, so far, I've only seen static rain images used while jumping around the game. Is the static rain something that was actually in the game the whole time, with the animated rain being an UmiTweak thing? If so, do we know how we could possibly replicate the animated rain?

Look at the rain animation system in the original UmiTweak patch and compare it to the current static rain implementation in the C# codebase. Check asset files and animation scripts to understand how rain is rendered. Determine if animated rain data exists and what changes are needed to enable it.

Written by the indexing model from the issue text.