Hey, I signed up for gbatemp so I could post about finding a bug on GodMode9 v1.5.0. I tried signing up at GitHub to file an issue there, but my account got instant banned for trying to use a disposable e-mail. Whoops, lol.
I was following the guide.3ds instructions to do a fresh install of Luma3DS v9.0, boot9strap v1.3, etc. on a New 3DS (original). Using the latest GodMode9 under emuNAND, all the .3ds files converted and built into .cia format causes the file sizes to double to the nearest 256 MB size.
After some 12 hours of conversion and then hopping over to FBI v2.4.14, none of the .cia batch files would install. I originally thought the problem was due to needing to update my title keys (I’m still fuzzing about this subject) after using TIKDevil, freeshop, Decrypt9WIP, but this problem still persisted.
The problem was recreate-able on a second, older CFWed N3DSXL that I own when it was updated to the latest GodMode9/Luma 3DS/boot9strap. When I reinstalled GodMode9 v1.4.3, CIA test building several .3ds files went back to outputting the correct trim sized .cia files that are installable on FBI.
Not to wish that there is a bug in your program because GodMode9 is damn mighty awesome and perfect in pretty much every conceivable aspect at this point user-friendly and programming wise, but I do hope I get my name added in your shout out.