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
Make sloped rail of any redstone variant
Push with piston to position without proper "supporting" block
Note that the rail is gone without dropping item
Bug starts in 1.15
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Comments

This is fixed in 1.16.2 Pre-release 2. It was probably fixed along with MC-152037.