MBP 15" 2015 thunderbolt ethernet bridge does not show disconnected after unplugging

Hi there,

After I take my MacBook from my desk and unplug the thunderbolt ethernet port (completely unplugged including the adapter) , my network settings keep showing that I am still connected. Because of the reason above, if I try to open Safari with Wi-Fi, it will not work because the computer still thinks it is connected with the ethernet cable. To solve the issue, I have to go to network settings and remove the thunderbolt connection manually. I never had this problem before and I thought this maybe had something to do with the new operating system (Big sur).

Does anyone know how to solve the problem?

Thank you in advance