Powered, Detector, and Activator Rails pushed onto air disappear without dropping.

What I expected to happen was...:
Powered, Detector, and Activator Rails pushed onto air should drop as items like normal rails do.

What actually happened was...:
When a piston (or Sticky Piston) pushes any of the special rails so that they would be on top of an air block (e.g. off of a ledge), they disappear, and do not drop as items. Tested all rail types, normal and Sticky pistons, and multiple orientations in Minecraft 1.8.9, 1.10.2, 1.12.2, 1.13.2, 1.14, 1.14.1, 1.14.2, and 1.14.3. Normal Rails are not affected, nor are versions 1.13.2 or below.

Steps to Reproduce:
1. Place a horizontally-facing piston and a Powered Rail, Detector Rail, or Activator Rail directly in front of it, so that the piston is facing into the rail.
2. Make sure that beyond the rail there is not a solid block for it to be pushed onto.
3. Power the piston.