Castle Conqueror Against (DSiWare) Fails to Save (Perhaps Read Fail?)

[SNBeast]

Your console: n3DS XL and DSi XL

Launch Method: Both from Twilight Menu++ and on SD, DSi mode, from Unlaunch 2.0 (DSi) / Luma 10.2,1 with 3GX loader on Sys 11.15.0 (3DS)

Version used: Release 0.54.2

Game tested/used/applicable: Castle Conqueror Against (USA) SHA-1: b3b8cfc0c01b87f98f4de16e3aca10e300f2e389 SHA-256: 5bd7d9cf460a5c6e7c1e8bb19a856a430a88cb7bae47a029fad164a6e3cb5e1a

Expected Behavior: Autosaving (the only saving) works and the save appears in the Main Menu.

Actual Behavior: Autosaving fails (it shows an error message where it would show that an autosave was made, how nice :D), and the failure is verifiable to

Steps to reproduce

1. Start a new game or load a game (if you can do the latter)
2. Beat the tutorial or a level, look at top-right corner
3. Notice it says autosave failed and go to the file select to see that the progress wasn't saved

nds-bootstrap.ini

3DS. Lemme know if you want DSi.

[NDS-BOOTSTRAP]
NDS_PATH = sd:/roms/dsiware/cca.app
SAV_PATH = sd:/ROMS/DSIWARE/SAVES/CCA.PUB
BOOST_CPU = 1
DEBUG = 0
LOCK_ARM9_SCFG_EXT = 0
LOGGING = 0
B4DS_MODE = 0
CACHE_FAT_TABLE = 0
ROMREAD_LED = 0
DMA_ROMREAD_LED = -1
PRECISE_VOLUME_CONTROL = 0
SDNAND = 0
MACRO_MODE = 0
SOUND_FREQ = 1
CONSOLE_MODEL = 2
HOTKEY = 284
APP_PATH = sd:/ROMS/DSIWARE/CCA.APP
PRV_PATH = sd:/ROMS/DSIWARE/SAVES/  
GUI_LANGUAGE = en
LANGUAGE = -1
REGION = -1
USE_ROM_REGION = 1
DSI_MODE = 1
BOOST_VRAM = 1
DONOR_SDK_VER = 5
GAME_SOFT_RESET = 1
PATCH_MPU_REGION = 0
PATCH_MPU_SIZE = 0
FORCE_SLEEP_PATCH = 0

Logs

3DS. Lemme know if you want DSi. NDSBTSRP.LOG

Other notes

I saw that a copied pub save from NAND didn't read a save file that certainly was there.