I want to localize my application. I'm trying to generate a .ts file by specifying the app directory:

pyside6-lupdate app -ts main.ts

But I get 0 source texts:

Scanning directory 'app'...
Updating 'main.ts'...
    Found 0 source text(s) (0 new and 0 already existing)

However, if I specify an individual Python file, it works correctly:

pyside6-lupdate app/src/main.py -ts main.ts

Updating 'main.ts'...
    Found 1 source text(s) (1 new and 0 already existing)

My Python files are located in app/src and its subdirectories.

What am I missing? Is it possible to recursively scan a directory containing Python files with pyside6-lupdate? What is the recommended way to generate a single .ts file from multiple Python files?