I noticed this while working with matt1020304050 in Cloud Edit. Current smooth terrain water doesn’t reflect any particles or “special” effects like neon glow.
Example:
This is how water currently reflects particles.
It looks better like this.
This is how water currently reflects particles.
It looks better like this.
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“Particles don’t reflect in water”
Your title is formulated as a bug report rather than a feature request. 
EDIT: OP moved it to bug reports
Not to mention it’s in bug reports. This is an okay suggestion I suppose, I’m not sure about the technical side though, I do know it’s not really a true “reflection” though. which is why it wouldn’t be reflecting particles
Yeah smooth terrain uses screen space reflection, but if they draw the particles before they draw terrain reflection then the particles should be in the reflection, too. I don’t know if that is possible though.