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Here is my working vcgencmd-Replacment:
https://pastebin.com/5n8zqL5a
Just copy&paste this into this file: /home/pi/MagicMirror/modules/MMM-PIR-Sensor/node_helper.js and replace the whole existing code there.
After that the Problem was fixed for me.
Uploading a photo is impossible for some reason. Can I mail you a photo? Peter