Filter Groups by DisplayName in Immersive mode returns Groups that does not match the DisplayName or mailNickName filter.

Run : graph o365group list to list all groups
Run : graph o365group list --displayName 'somerandomstring'
To list all groups with that displayName and you will find that it returns all items of the previous call. Adding the --debug flag shows that the Graph Query is correct and that it does return an empty object if there are no items, but it stills show the previous results.