Sloped redstone type rail not dropping item when pushed by piston to a spot without adjacent block

Sloped powered rails, activator rails, and detector rails should drop their item when they are pushed by a piston to a location without a block "supporting" them, but instead they just disappear, and do not drop the item.  Regular rails are not affected by this, as they drop the item. This work in all directing in all four directions, and with powered rails, activator rails, and detector rails. 

Steps to reproduce

1. Make sloped rail of any redstone variant

2. Push with piston to position without proper "supporting" block

3. Note that the rail is gone without dropping item

Bug starts in 1.15