It may have to do with how butano does logs, I'd have to reread that section of the docs. thanks for letting me know though.
I don't have experience with butano, but I took a quick look through the code and found out that log function has different implementations separated by an #ifdef statement depending on the target emulator. Not an advised opinion, but I think you should have a different build compatible with each emulator you want to display log messages in. Hope you can get something useful from these!