Hi @felmue,
I see on GitHub that your pull request has been merged, but it hasn't yet been published as a new version release of the Arduino library (which I confirmed by uninstalling and reinstalling the library). The latest library version is still set as release 0.0.2 from July 24, which indicates that there are 2 commits that have been made (yours and Tinyu's) since the release. Not sure what M5Stack's process is for releasing new versions of libraries, but it is interesting to see how sausage is made.