You can't place water on signs in either creative or survival.
Comments 3
What I expected to happen was...:
When you right click on a sign with a water bucket it places the water on the sign.
What actually happened was...:
It places the water past the sign or if you're in creative it just doesn't place the water.
Steps to Reproduce:
1. Place a sign.
2. Try to place water on it.
3. I don't know how else I could have explained it.
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