At the moment blocks protected with preciousstones are not able to be moved by any type of piston.

To fix this issue, when a piston is activated the plugin should check if both the owner of the piston and block which it is connected to are the same, if they are the same then the block should be allowed to move.

Note I only use protected block feature of ps.

It's not that simple. Because the protection field will not move with the block, it is recorded in the database by location.