I wasn't able to replicate the issue nor was I able to find the space from your first example, but this occurs when you don't have a homepage set for the space.
To set a homepage go to Space Tools > Overview > Space Details > Edit > Home page: and you can set a homepage there.
Can you try that on the affected spaces and let us know how it goes?
I'm sorry for being late,
I tried your suggested solution and it works.
But I think that the homepage setting for the space seem does not relate to the page tree on sidebar, and i saw no notice from Confluent about "you have to set the homepage for the space to make the page tree works", or may be i missed that notice. Could you explain that?
Thank you very much for your help,
Essentially the homepage of a space works like a parent of all the other pages on the space, so when you remove the homepage itself, or remove it from the space settings, you're basically orphaning all the other pages below it. This causes issues like the one you saw as well as many other issues.
I was able to find two suggestions to prevent users from breaking their page tree by removing a space home page
Do you remember having removed the home page itself, or was it a mistake? If you do remember, could you let me know the reason behind it? Did you intend to use another page later, or did you want the space to have another behavior when you browse to it? I would like to use this information to provide you with another solution while using the space home page functionality.
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