If Fukua spawns her clone special without releasing it with a second tap and immediately tags out, then Umbrella tags in and uses her unblockable blockbuster, Umbrella will use Fukua's clone's momentum to travel forward.
The AI performed this against me and replicating it was extremely easy.
No testing was done with other blockbusters. Tested on a couple blockbusters for good measure. No issues with these ones: Ms. Fortune, Parasoul, Black Dahlia, Annie. I thought the cause would be a throw animation, but neither Ms. Fortune nor Annie triggered it. Tested Parasoul and an air Black Dahlia for projectile related ones, in case it was related to the lack of running up animation when the blockbuster is triggered, or aerial state before the blockbuster is triggered. No dice.
Edited for readability and because I figured out I was wrong.
Video proof:
The AI performed this against me and replicating it was extremely easy.
Edited for readability and because I figured out I was wrong.
Video proof:
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