Sand is duplicated when the falling sand is pistoned into the End Gateway Portal.

Observed Result

• The falling sand is picked up by the piston and pushed into the gate by the sticky piston, creating a transfer effect and duplicating the sand at the end of the End Gateway Portal.
  Delays are observed in 6tick and 8tick cycles.

Something goes through the gate when it is pushed by the sticky piston, is this problematic behaviour?
If it works, I'd like to build it with the device.