This was indeed a tiny fallout from migrating the Fennec nightlies to esr68. We'll add that support soon but for now, we've updated the entries manually so that https://download.mozilla.org/?product=fennec-nightly-latest&os=android&lang=multi returns the correct values of 68.1a1. Feel free to re-open should you notice anything suspicious again. Thanks!
Bug 1565863 Comment 6 Edit History
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This was indeed a tiny fallout from migrating the Fennec nightlies to esr68. Support to automate that is coming soon, but for now Johan updated the entries manually so that https://download.mozilla.org/?product=fennec-nightly-latest&os=android&lang=multi returns the correct values of 68.1a1. Works for me for now so I'll close this. Feel free to re-open should you notice anything suspicious again.