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Downward vine from question block?

Hello, I am trying to create a question block that, when hit, creates a downward vine. I've tried a few combinations of the custom question mark blocks and custom growing vine sprite but I just can't seem to get it to work. Anyone have any ideas on how to achieve this? Thank you!
Originally posted by JackTheSpades
You could use this disassembly.
All you should have to do is inver the Y speed.

Code
LDA #$F0		; set the sprite's (change to #$10)
STA $AA,x	; Y speed


And the sprites graphics:

Code
NoFlip:
ORA $64		; add in priority bits
ORA #$80	; y-flip (add this line)
STA $0303,y	; store tile properties

 ---> Magic: The Gathering Legends <---
                                                                                                
That's actually one of the ones I tried, reversing the y-speed and everything but when I put it in the question block it wouldn't come out. I think the block itself is blocking the sprite from coming out. I tried to lower the sprite spawn's y position but I still get an empty brown box when I hit the question block.