To reproduce:
1. Place sideways piston
2. Place flower pot on top
3. Power piston
4. Observe the flower pot stay put
5. Place block next to flower pot without unpowering piston
6. Observe the flower pot pop off
Related issues
is duplicated by
Comments


You can place them on the top of extended upwards/downwards pistons, but sideways pistons only allow placement in their retracted state.

Is this still an issue in the latest snapshot 16w44a? If so please update the affected versions.
This is an automated comment on any open or reopened issue with out-of-date affected versions.
Just a question, are flower pots or other stuff allowed to be placed on extended pistons?