Not A Bug Otawara not granted cost reduction from planeswalker

[notjohn9003]

Attempted to channel an Otawara on an opposing manland for 2U as I had a Jace, Wielder of Mysteries in play. Was still asking for the full cost of 3U
Game ID of occurrence #819788032

 

[jackey730716]

3U: discard Otawara, Soaring City: Return target artifact, creature, enchantment, or planeswalker to its owner’s hand. This ability costs {1} less to activate for each legendary creature you control.

The ability counts only creatures but not planeswalkers, so you should pay 3U.