So had an issue when I installed the Fernschreiber app. Afterwards clicking on any link would take me to the app instead of to the browser, the only way out would be to restart the phone. I uninstalled the app but then links wouldn’t open at all.
I installed Webcat to see what would happen, I did get a prompt to open the link in Webcat. It now gives me the option to open the link in either Webcat or Fernschreiber.
I remember reading about someone that had a similar issue years ago (with a different app) but I cannot remember what the solution was.