autoGrantPermissions with Android device works on Windows, Linux, but not OSX

I'm using an Appium server to run tests on physical Android and iOS devices. At the moment the tests are very simple (using Appium through RobotFramework, with RobotFramework-AppiumLibrary), and work well on both Windows and Linux computers.

I'm using the autoGrantPermissions=true Appium capabilities (see: Appium Capabilities) to ensure that no permission window makes the test suite fail. When running the test with a Windows/Linux Appium server, it works: the permissions pop-up never shows up.

When running the test with an OSX Appium server, it doesn't work. The permissions pop-up arises, and stops the whole test-suite.

I've tried adding the autoAcceptAlerts capability, but it doesn't help.

Thanks in advance for any answer.