Homeguards Bug

If you sit in base with Homeguards, and then sell them for a different enchantment, e.g. Alacrity or Captain, will effectively give you both. You will get the new boots with the new Captain or Alacrity buff, but at the same time you still have Homeguard and can run out of base like a Rammus on steroids (of course only once, upon returning back homegaurds won't be active any more).

I think as soon as you exchange the homeguard enchantment, you should lose the buff, no?