Updated the Uberfix issue on this.
In addition to Ironwalkers and Desperate boots, there may be other items that exhibit this problem. I say this a lot, but if I get the time I'll peruse the item files and look for other infinite-duration buffs that are added by non-standard means (e.g. a manual AddBuff call in an aura pulse or other conditional block, instead of just being included in the Ability's buffs table).
If anyone else wants to do this, or test other similar items in-game, that'd be great.