[GAMEPLAY] Visual bug with Muramana Icon

[SUMMARY]:
Muramana displays as being off after dying with it active.

[DETAIL]: Dieing with Muramana toggled on will cause the animation (the little blue swirly bits) on the icon (above the central dispaly) to disappear so that after respawning Muramana looks as though it were toggled off, however it is still toggled on (It still uses mana and deals bonus damage as it is supposed to).

Toggling Muramana again will cause the icon to stay toggled off and it actually will toggle off, toggling another time will both turn the item on again and turn the animation on the icon on again.

[REPRODUCTION]:

1. Buy Manamune and fully stack it so that it turns into Muramana.
2. Toggle the item on.
3. Die with the item still toggled on. Upon respawning the icon will no longer have the display animation.

I have encountered this bug 100% of times I do the above steps while playing Ezreal on Summoners Rift (~10 games).

This bug is purely a visual display bug, however it can be misleading as going to clear a minion wave one may think that the item is off when it isn't and so uses up their mana.