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I found what I was missing.
\data\maps\outdoor_sprites.asm
The sprites that were not showing properly were not defined in the list of sprites for that map group.
I have no idea why the SPRITE_OAK I've added to PalletTown.asm is showing up as the player character
I've added cont PALLETTOWN_OAK at the top.
object_const_def
const PALLETTOWN_TEACHER
const PALLETTOWN_FISHER
const PALLETTOWN_OAK
And I've added an object_event SPRITE_OAK at...