When a user is trying to mention another user, for example in a comment on an issue or in the description field, we are currently seeing a lot of strange users being suggested. See the screenshot below.

It appears that they are some sort of "application user", however, with the exception of the eSign and Automation plugin listed there, none of the mentioned components are actually even in use by us (we don't have Jira Service Management, Spreadsheets or Statauspage, and we do not have any links to Outlook or Teams set up).
These users are not listed in the "Assignee" user picker for example, they appear to only show up when mentioning users.
Is there any way to prevent this behavior, i.E. only suggest users that are actually active in the instance?
The fact that a lot of application users contain the phrase "for Jira" makes this problem especially visible when trying to mention users called "Jim" for example ;-)