When playing Etrian Odyssey III on DeSmuME, the upper left corner of the battle screen is missing. Comparing the screenshots, you can see that the turn notations are missing. I think this is a problem with DeSmuME Core, since there is no problem with melonDS Core or official(*) DeSmuME. *https://ci.appveyor.com/project/zeromus/desmume/build/artifacts
DeSMuME Core
melonDS Core