This has been around since November 2020.
I reported it in-app at the time, but got a not-very-convincing ‘I’ve forwarded it to the development team’ response.
It doesn’t matter what the Labs toggle is set to, the JA is always first. Even on different devices with a fresh install of the app, proving this is a server-side issue. Not many people use JA’s in anger so it’s likely to be a tiny issue in the grand scheme of things, but enough to annoy JA users.
To confuse matters further, another user (on iOS) reported they couldn’t get the JA to be first, regardless of the Labs setting - which is exactly the opposite to our experience of this issue.