When a player steps over a sticky piston with a fence while the piston is retracting, if there's enough space around/below the piston, the player will be teleported over there.

It seems to be a different issue than MCPE-175206 since that was marked as resolved, and the consequences are not the same. It also seems to only happen when the piston is pointing vertically upwards.

It happens both on vanilla servers and in single-player.

Link to the video