In https://github.com/matomo-org/matomo/pull/14858 we added a feature to define a config
live_query_max_execution_time to limit the max time a live query is executed for. If someone is using the Visitor Profile widget in the Dashboard, and if this setting is configured, and if a query takes too long, it may result in an error being shown in the UI.
Expected: It would say "The request took too long to execute. Please try ..." or something similar instead of a generic error message.
Because the query is used to fetch a specific profile this should always be fairly fast so I don't assume it's a big problem and combination of the widget being used and this setting being configured etc be rare.