[Gameplay] Muramana 0g sell value?

I just played an ARAM with Pantheon and built a manamune. Once i reached full build, i sold the now upgraded Muramana and got zero gold, upon pressing the undo button in the shop, the "sell" tag was "0g", is this normal? Because in summoners rift it has a sell value as far as i know. i also found a older bug report (" Muramana resell price" by "e46 Fanatic") about the same issue so i'm not sure if this is intended.