Basic Questions & Answers thread

Boing-o-bot troubles again...

Code (Text):

1.  
2. ; for Boing-o-Bot
3. loc_3F9CE:
4.     sub.w    d0,d5
5.     cmpi.w    #$10,d5
6.     bhs.s    BranchTo_Touch_Enemy
7.     move.w    x_pos(a1),d0
8.     subq.w    #4,d0
9.     btst    #0,status(a1)
10.     beq.s    +
11.     subi.w    #$2,d0
12. +
13.     clr.w    d2
14.     move.b    width_pixels(a1),d2
15.     neg.w    d2
16.     subi.w    #$10,d2
17.     sub.w    d2,d0
18.     bcc.s    .check_hurt
19.     addi.w    #$18,d0
20.     subi.w    #$20,y_pos(a0)
21.     move.w    #-$A00,y_vel(a0)
22.     bset    #1,status(a0)
23.     bclr    #3,status(a0)
24.     clr.b    jumping(a0)
25.     cmpi.b    #ObjID_Tails,id(a0)
26.     bne.s    +
27.     move.b    #2,double_jump_flag(a0)
28. +
29.     move.b    #AniIDSonAni_Spring,anim(a0)
30.     move.b    #SndID_Spring,d0
31.     jmp    (PlaySound).l
32. .check_hurt:
33.     bra.s    BranchTo_Touch_Enemy
34.  

the object works mostly fine, except if you roll into it, it acts like you jumped on it and erroneously bounces you up.
is there some mistake I've made here?

 

I have a question: Has anyone ever dealt with Sonic 2's uncompressed animated art breaking out of a sudden? I just realized they've been static all this time and I don't know how to fix these.
I barely touch the source code since I'm an ASM noob so I don't really know what happened. The last alterations I've made were to split EHZ and ARZ's water palettes and changing some title cards. I also realized that the sound driver also broke whenever the 1-up sound played which forced me to use a very early backup and port those changes back to it. I was using the 2019 version of MM's Sonic 2's Sound Driver Plus disassembly.

PS: I've managed to find some very old versions of my source code on Discord and did a frankenstein to solve all of these problems, but if anyone still wants to explain on why does these level animations break, feel free to do so.