[bug] Homeguard boots effect still there for 10 sec or so, after the boots are sold

I played Hecarim in a custom game to test few builds. At certain point I sold Boots of Mobility with homeguard, and bought Boots of Mobility with Alacrity, but homeguard speed boost was still active until I left the base. After it dissipated after a few seconds it was back to normal. In a second instance I stayed in base, and after 10 seconds or so homeguard speed boost stopped, and I lost a boost, as intended.
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