Resource packs with custom namespaces cause the "English (US)" language to fail to load

When loading a resource pack in Snapshot 7 it gives me an error that says Translation file for en_us was empty or missing. Restart your game and launcher the try again. I have tried restarting the game and launcher, but still get the same error.

I also went through and tried multiple resource packs, and proceeded to get the error on all of them. When downgrading to Snapshot 6 and trying the same packs, I did not receive the error, so I believe there is a missing or corrupt file in the 7th Snapshot of 26.3.