watchOS 5 beta temporarily unavailable as Apple fixes an issue that may occur while updating

The watchOS 5 beta seed, which went live on Apple's developer site following the WWDC 2018 keynote on January 4 has been temporarily halted. This is in order to fix an issue some developers might experience while updating. It's my understanding Apple wants to address the issues before resuming the seed.
If you go to developer.apple.com now, you'll see the following:
Seed 1 of watchOS 5 is temporarily unavailable. We are investigating an issue that may occur while updating. If you've experienced any issues, please contact AppleCare.
Betas for iOS 12, tvOS 12, and macOS Mojave remain available. The beta for watchOS 5 should resume soon.
watchOS 5: Everything you need to know
○ Everything about WWDC 2020
○ WWDC 2020 remote lineup
○ Download the Apple Developer app (opens in new tab)
○ iOS/iPadOS 14
○ macOS 10.16
○ watchOS 7
○ tvOS 14
○ Discussion forums
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Rene Ritchie is one of the most respected Apple analysts in the business, reaching a combined audience of over 40 million readers a month. His YouTube channel, Vector, has over 90 thousand subscribers and 14 million views and his podcasts, including Debug, have been downloaded over 20 million times. He also regularly co-hosts MacBreak Weekly for the TWiT network and co-hosted CES Live! and Talk Mobile. Based in Montreal, Rene is a former director of product marketing, web developer, and graphic designer. He's authored several books and appeared on numerous television and radio segments to discuss Apple and the technology industry. When not working, he likes to cook, grapple, and spend time with his friends and family.
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The "issue" is that a lot of Series 2 watches would not update. Reddit and dev forums are filled with people who have 'updated' several times, but the watch restarted in the original v4 version.
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There was probably an error during the update process, at which point the device rolled back the version.