Internet interface seems not to work as intended

[Wildzekat]

Selecting an Interface
For testing, I opened a hotspot and used lo as input aka Internet Interface. This should mean, that loop own is applied. I also tested it with wwan0, which is my empty SIM slot.

Expectation: No Internet
The expected result is that no Internet Access can be made, as a result of pulling from a not connected source.

Result: Internet
Both attempts resulted in me being able to visit various websites and articles, and no, none could be cached, I specifically watched out to avoid such a coincidence by selecting different sites each attempt.

Possible Culprit: Wifi Interface
In both attempts, the Wifi Interface was both used for the ap and maintained regular access to the Internet from NetworkManager.

To confirm the extent of this bug, it should be tested, whether this behavior continues occurring when the working source is a LAN cable, the attempted source is an empty WWAN adapter and the output is on the disconnected WLAN adapter.
I can't guarantee being able to test for this case in the near future, so I will note it here for now.

Summary:
What definitely is a bug: Even when selecting a completely different Internet interface, it runs Internet over the Wifi Interface? or the first working source automatically / simultaneously.
It still needs to be tested if this is a result of checking for the first working Interface or Wifi Interface is also secondary Internet Interface.

[GlitchedCrimson]

i also have the same issue, it just makes duplicated wireless-ac connections without even broadcasting a hotspot

but i found alternatives, if your on mint, you can go to the network manager and enable a hotspot.
it isn't very stable and depends on ur wifi card (hardware).

edit: when you connect via Ur phone or tablet the wifi will show itself as loading forever, but its just broadcasting a LAN-only connection.

[Wildzekat]

@thatglitchedcat That doesnt sound like the same issue

If I understand you right, it doesnt know of its active hotspot instance and launches a new one every time you try to start it, right?

Mine Issue is that it just broadcasts my internet connection even when I didnt select that connection to be shared.

(Of course it depends on hardware, yes, not all wifi chips support creating aps.)
My network manager has that too, but I wanted better control over my hotspot and to overview connected devices.
Also, this cool thing can redirect it's wifi internet onto another wifi hotspot to serve as a repeater or translate 5 GHz Networks into 2.4 GHz ranges

Regarding your latest issue, can you describe that in a more detailed way? What exactly happened and how it came to happen like that?