@inventaire looks like I can click and view profiles of all your examples, and I can search for them from mastodon, except for users. Searching for @Georges results in a 500 error, but searching for @wd-Q46248 works correctly.
@roptat that bug should now have been fixed thank to the help of @nicksellen, see today's conversation in our matrix chat room https://app.element.io/#/room/!AOQAmuGzABOXsJhZgM:matrix.org
@roptat it seems to happen sometimes and sometimes not, and unfortunately we don't see the error in our logs, so that might be some problem in our implementation that Mastodon doesn't like 🤔