Remote access stops working after changing the country

I am using Version 2.19.0 and everything worked fine. But then I changed the regional settings (Regionale Einstellungen) in openhab system. I changed the country/region from “Not defined” to “Deutschland”. Then remote access of the openhab GUI stops working. No error message, just a black screen. In the local network everything works fine. If I change the country setting back to “Not defined”, everything works again. But of course I would like to use “Deutschland” because of the label language.
I think this is a bug or does anybody has a solution?

Edit: I am talking about android app version 2.19.0 and remote access

Could you check again. There is / was no OH 2.19.0 version. So could you please explain what software resp. what software version you are talking about ?

2.19.0 is the version of the Android app. Because I thought it is a problem of the app. Openhab version is 3.1

This is really weird… I have been having the same issue for quite some time now - it is also logged on GitHub.

I just tried to remove the Country/Region in my regional settings after testing and confirming that my OpenHAB 3 UI does not come up (blank screen).

After removing the Country /Region as suggested I get some information on the page - though garbled. Not sure why this should have an effect of the page displaying but might give the developers more to look at?

Not even sure where the Basic UI information comes from - not from my system.

After reverting the openHAB setting back (Country/Region - South Africa it works like above for a while then page is blank again.