I think I found a bug in Power BI Service. I have several Power BI Premium workspaces and sometimes a wrong bookmark ID is generated and it causes an error. Here is an example of the actions I did:
Open Workspace 1 (Premium) and open Report 1
Navigate the report by using some links used in the buttons of the report. Let's say that the navigation experience ends with bookmark ID Bookmarkabcdefg12345.
Open Workspace 2 (Premium)
By mouseover on the link of Report 2, I see that the last argument of the URL is bookmarkGuid=Bookmarkabcdefg12345 (it's the same ID used in Report 1). Clearly, if I open this link, the error "The bookmark isn't available" comes up becasuse the bookmark doesn't exist in Report 2 (instead, it does in Report 1).