Sticky Pistons Delete Rails

When a stick piston retracts above a rail, the rail is pulled up. Regular rails are dropped, but detector, power, and activator rails are deleted.

What I expected to happen was...:
Rails are either left in place or drop themselves.

What actually happened was...:
The rails were picked up by the sticky piston and then 3 out of 4 rails were deleted.

Steps to Reproduce:
See image attached.