It has the Week 6 sprites in the game files, just not the chart nor music
Viewing post in Friday Night Funkin' Old Versions comments
Hello, week 6 exists in the game, but since it was a beta version, it wasn't included in freeplay or story mode. However, if you want to play it, go to assets > data > freeplaySonglist.txt and put the song names, keeping in mind that the song Roses hadn't been added to the game yet, so it bugs and doesn't load.