Turret HP Bug [GAMEPLAY]

The bug that I have encountered is one having to do with the mini map. At least on my screen ever since patch 6.12, the mini map will display all turret that haven't been destroyed at full HP regardless of the actual state of the structure. This is not a huge bug but it sometimes does confuse me. It actually made me waste my Teleport Summoner Spell because I thought my turret was at full HP but it was actually very low and Irelia destroyed it before I could complete my channel. There is no specific way to encounter this bug. It is always there, and there are no steps taken beforehand to cause this. It will happen from the start of the game until the conclusion of the game.