"any piston extension" is not recognized

[Pilvinen]

1. Place sticky piston on the ground and activate it.
2. Place iron block next to the piston extension with this code loaded:

on place of iron block:
loop blocks in radius 1 of location of event-block:
if loop-block is any piston extension:
broadcast " It's working!"
if "%loop-block%" is "any piston extension":
broadcast " It's working, sort of..."

Only the latter part of the code will trigger.