’ The Soft Foam Sword is useable on NPCs that are a trivial difficulty to your character. This means that it can only be used if the character is at least 20 levels higher than the NPC you’re targeting.
The sword has a couple of other limitations: it cannot be used in dungeon or raid instances and cannot be used on rare elite creatures.’
It could be that the level squish has made the 20 level higher thing more difficult
/edit I should’ve said that the 2 quoted paras are from the Support site.
The Soft Foam Sword requiring a 20 levels difference have been unpractical for my two lvl 35-alts doing the Lunk-quests in Searing Gorge while working up Thorium Brotherhood rep for transmog recipes. Although SG is not that far from Stormwind, it is still damn unpractical to go to SW just to enable and then disable Chromie time just for these two quests for each alt.