QtCreator doesn't detect file modifications

When modifying an open file from an external tool, Qt Creator doesn't detect the modification (the "When files are externally modified" option is set to always ask, but I still don't get the dialog).

When adding or removing files from a project via the project tree (in .qrc or just the .pro), Qt Creator still displays the removed files or doesn't display the newly added files. I have to trigger a reparsing of the project by changing the build type (Debug <-> Release).

I'm on macOS Sierra (10.12.6).
My File System is: Mac OS Extended (Case-sensitive, Journaled, Encrypted)

Other editors (Visual Studio Code) correctly see external modifications.
I've made a sample console app with a `QFileSystemWatcher` and it works too.