MSBT mod files do not load under certain conditions

[ThatNintendoNerd]

User Setup

System Firmware Version: 14.1.2
Atmosphère Version: 1.4.0 (sysMMC)
Smash Version: 13.0.1
ARCropolis Version: 3.8.0

Bug Info

MSBT mod files sometimes do not get loaded by ARCropolis. Below are the conditions that must be met for this bug to occur:

• The MSBT mod file name includes a regional indicator (e.g., msg_name+us_en.msbt, where +us_en is the regional indicator).
• One or more XMSBT patches exist for a particular MSBT file.

If any of these conditions are not met, the issue does not occur.

How to Reproduce

1. Start with an empty mods folder, or use mods that do not include any MSBT or XMSBT files to guarantee results.
2. Use this mod file package: arcropolis_messageissue.zip
   The changes made affect the main menu, where the Smash and Spirits titles have been changed. If the current regional indicator is inconvenient, simply rename it to the region you want to use for both files.
   a. In the MSBT file, "Smash" was changed to "FixMe"
   b. In the XMSBT file, "Spirits" was changed to "ARCropolis"
3. Only the XMSBT changes will take effect, when the expected outcome is that both changes take effect.