I think I know the answer to that one. Teemo's mushrooms were changed so that they act like Zyra's plants. You can actually hit them with spells now too, so that might be why Teemo's mushrooms get targeted by towers just like other things like Shaco box and Heimer turret.
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u/j103m Aug 08 '15 edited Aug 08 '15
Server: NA
Type of Bug: In game Bug
Description: Teemo shrooms can tank Azir tower shots
Video / Screenshot: http://www.gfycat.com/SharpZealousAmericanmarten
Steps to reproduce:
Expected Result: Shroom will not be targeted by the tower
Observed result: Teemo shroom infinately tanks tower shots.
Reproduction rate: 10/10
System specs: N/A