The same is true for using a free runaway on a summoned monster. Not that you would do so, but in all of the above cases, the only thing that KoLmafia knows is that you are about to go into a fight. It has no way of knowing whether you are going to complete the fight in a way that consumes a turn.
"The fight costs an adventure, not the skill" ... So, I guess you would say "Using a Spooky Putty sheet does not cost a turn. Only the fight costs a turn." Seems like a pointless distinction, to me; anything that MIGHT cost a turn gets logged in the session log with the current turn count and the name of the thing that leads to an encounter.
Therefore, the fact that it seems "odd" to you is irrelevant.