Rain cannot been seen through stained glass

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What I expected to happen was...:
Describe what you thought should happen here

what should happen is to see the rain out of a stained glass pane or glass block

What actually happened was...:
Describe what happened here

there was no rain when i look thru stained glass panes and stained glass blocks all you can see is the particles hitting the ground

Steps to Reproduce:
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2. ...
3. ...