I think I'm having a similar issue. The install goes normally, and even gets through the phase with the time estimate before having an issue. Once it reboots again, the progress bar stops at roughly 25% and does not progress, even if left alone for an hour.
Jake3231
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@jaespeaks, I'm running into the same issue with python3, which is more concerning now that Monterey displays a warning for apps that use Python 2.7.
Are you still seeing this on a current version of macOS?
Are you still hitting this on beta 3? And if so it's probably worth filing a Feedback report.