Currently, there’s the option to flag a topic after it has been flagged.
After you report a post you receive this message:
but users can use the flag option multiple times until the post is hidden by using the option below:
The menu also doesn’t include the “Off-topic” option.
Don’t worry after you try to actually flag it, you get an error.
The option to flag should disappear completely after it was already flagged by the user to avoid any inconveniences.
Hope you’re doing well.