Decompilation issues when memory map section is not present in symbol maps

[Zephiles]

This specific issue was found with new symbol maps that were made for Paper Mario: The Thousand-Year Door. When all of the rel files are loaded with symbol maps that do not have memory map sections, some parts of the code fail to decompile properly:

To go along with this, various sections after these decompilation failures end up as undefined functions:

To clarify, these issues should not be caused by the symbol maps themselves, because the decompilation works fine if the memory map sections are provided. For testing purposes, I'm including a zip that has the symbol maps for the Japanese retail version, both with and without the memory map sections:

JP_Symbol_Maps.zip