Hi Daniel, I tested this issue using 66 Beta 14 and in my case the Beta updated correctly to 67 Beta 1. Also, I tried on the 68 Nightly 2019/03/19 and the update works correctly. Can you please retest this with Beta Firefox? and if you want you can try to test this on Nightly, here is the link for download https://www.mozilla.org/en-US/firefox/nightly/all/
Bug 1535818 Comment 1 Edit History
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Hi Daniel, I tested this issue on Win 10 using 66 Beta 14 and in my case the Beta updated correctly to 67 Beta 1. Also, I tried on the 68 Nightly 2019/03/19 and the update works correctly. Can you please retest this with Beta Firefox? and if you want you can try to test this on Nightly, here is the link for download https://www.mozilla.org/en-US/firefox/nightly/all/