Bug Report - Editing storage in PKSM disrupts HeartGold cartridge's ability to save correctly

[fireanddream]

Describe the bug
On a Japanese HeartGold cartridge, making changes to storage will write a readable save file with no issue.
However, when I load up that save file, make some changes to storage (in-game), and save, the next time I boot up the game it says it's corrupted the reverts to my backup save file.

To Reproduce

1. Open PKSM and make changes to three boxes, releasing one pokemon from each, not editing anything else.
2. Write save to cartridge.
3. Boot up the game, go to a PC and take out a single pokemon. Save and shut down the console.
4. The next time the game boots up, it shows the error message and reads the backup save.

Expected behavior
The game reads the save it created normally after a PKSM edit.

Screenshots

Information about your environment

• OS version: 3ds LL at the latest firmware
• PKSM version: PKSM v10.1.1-aca22663
• Entrypoint: luma CFW

Additional context
PKSM still reads the latest save file (created by the game) perfectly.
I don't have any issue with dirty contact points or any other games mulfunctioning.
Most importantly, if I save twice in-game, the save file is read successfully after a restart.
My save file at all three stages:
https://mega.nz/folder/sHIHjKBR#b2SZsKp5WUnz-66-NL59Rw