Hello Jeffrey Lee,
Since the issue has resolved itself automatically, we’re unable to determine the exact root cause. However, based on our observations, it’s quite likely that the soft delete feature contributed to the resource group (RG) remaining visible in the portal for more than a day. This behavior is commonly associated with soft delete scenarios, which is why I’m emphasizing it as the most probable explanation.
If the information and efforts we've provided have helped address your query, I kindly request you to Accept the answer and Upvote it. Doing so not only acknowledges the support but also helps other community members who might encounter a similar issue.
Thanks again, and please feel free to reach out if you have any further questions.