Bing is telling me that safesearch has been set to strict because the browser communicated for a safe browsing experience. It only does this in EdgeC.
Searching from the start menu returns normal results, and searching from my phone works fine too.
I also disabled the safesearch request header in about:flags, but that did not help.
Build is Version: 78.0.274.0 Canary.

EDIT: As of version 78.0.276.0 this appears to be resolved