Rain effects cannot be seen though colored stained glass panels but, may be seen thou normal glass panels.
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Duplicate ofย MC-188529, which was later resolved as "Won't Fix". You can switch to the "Fabulous!" graphic settings in order to resolve this issue.

Thank you for your report!
We're tracking this issue as MC-188529, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as Won't Fix, which means this is considered a bug but won't be fixed. The description of that ticket or the comments might explain the rationale. Please do not leave a comment on the linked ticket.
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Hello Isaac, the bug you describe is not a Launcher bug - you are in the wrong project area here, this is only for bugposts about the Launcher ๐
The bug you describe could be MC-186538, if it's for JE.