When you build a Colored Glass above a Cloud it looks like the glass is inside the cloud or the clouds look bugged , and same if you build water .
Screenshots:
In the Picture 3 you can see that from the Under it looks normal .
In the Picture 4 Normall Glass with Water on it above a cloud even changes its Textures to blue .
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Duplicate of MC-9553

This issue has been reported already. It has been linked to the original bugreport.
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