Garen q doesn't damage Teemo Shrooms

I have three sets of examples, this one was one from a custom game, the other two in public. I am not sure if it is just Rogue Admiral Garen or if it applies to all of Garen. The Teemo Skin doesn't matter. Example 1(actual game): https://youtu.be/FygUJB_3kME Example 2 (Same game): https://youtu.be/MWz3OZl17o0 Example 3 (custom game): https://youtu.be/BoZ1mC6KV1I