Patch 6.16 bug - Noxious Trap (and potentially other traps)'s timer

Hello, I am writing here to report a bug which affects the game in patch 6.16

Teemo's mushrooms, his Noxious Trap, have a misleading timer attached to them: in fact, the time bar is always full, regardless of when the trap has been placed, and, by left-clicking on one of the mushrooms, it always shows "300/300". The bug is, fortunately, only a visual problem, since mushrooms expire after 300 seconds of being on the ground -as it should be-, and it makes timing how much they will last extremely difficult.

I have tested it in custom games, and while wards (both from the trinket and the Sightstone) are not affected, Teemo's mushrooms are, and I suspect it could be the same for other trap abilities (Jhin's E and Shaco's W), although I am unable to test it and confirm or deny this assumption (could someone please test it? =))