Hi everyone,
since today I face an issue that my PCF cannot be tested using npm start watch.
The entire process runs smooth till the page is opened. It doesn't work for any of my already implemented PCF.
Those are working PCFs and already live, so I am sure that they are implemented correctly.
I get strange errors inside the console:

Those don't look like they are related to my problem, yet haven't seen them before.
Page looks like that:

Any idea?