Basically, when ever you put a Wither Rose on a Flower Pot it would not wither you when you stand on it.
The first picture shows how its suppose to work.
The second picture is me not taking damage on top of the flower pot
The third picture is my house in 1.14 snapshots 🙂
Also I found out that you don't take damage on cactus in a flower pot as well...
Anyway I hope this helps and is a bug
-EeGe
Thank you for your report!
However, this issue has been closed as a Duplicate of MC-2241 and MC-138024.
It has been linked to this report. If you have additional information, please add it to the duplicated report.
Please search before reporting, as it's likely that one exists already.
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