OS: Pop!_OS 22.04
Wolfram products: Mathematica 13.1 and 12.0

Issue:
WolframApp::try_default() returns an Error on Linux and Other operating systems when try_wolframscript_installation_directory() is successful because WolframApp::from_installation_directory(dir) errors for these system types. This is incorrect behavior, since wolframscript is discoverable on $PATH thus wolfram_app_discovery::discover_with_filter should be given a chance to locate it.
I am working on a Pull Request that will add minimal extra logic within try_default() to solve the problem.