Board Thread:SMG4 Discussion/@comment-33613830-20180907000355/@comment-33613830-20180923004617

Here's my theory regarding Waluigi's T-Pose Mushrooms.

When he gave one to Shroomy in Mario and the T-Pose Virus, that mushroom was likely a prototype, hence why it was curable. However, the one Waluigi used in Mario Convention was likely the final version of the Mushroom, hence why it is not curable.