The Wire.requestfrom() should not be used together with Wire.beginTransmission() or Wire.endTransmission().

[Koepel]

The Wire.beginTransmission() and Wire.endTransmission() should only be used when writing data.
The Wire.requestFrom() does the whole I2C session on its own, it should not be used together with those functions to write data.
See also my alternative explanation of the functions of the Wire library.

I noticed a Wire.beginTransmission() and Wire.endTransmission() around a Wire.requestFrom() in the function Arduino_i2c_read() in the file RawButtonDemoCode.ino.
https://github.com/MatrixOrbital/GTT-Arduino-RawButton-Demo/blob/master/ArduinoCode/RawButtonDemoCode/RawButtonDemoCode.ino

Those Wire.beginTransmission() and Wire.endTransmission() may be removed.
Explanation: Common-mistakes, number 2 and 3.

In a other repository is a Wire.beginTransmission() before the Wire.requestFrom(), in the function i2cRead() in the file GTT_Arduino_Thermometer_Demo.ino.
https://github.com/MatrixOrbital/GTT-Arduino-Thermometer-Demo/blob/master/GTT_Arduino_Thermometer_Demo/GTT_Arduino_Thermometer_Demo.ino