A similar bug was marked as intermittent in 1.8.5:
https://forum.arduino.cc/index.php?topic=524733.0
The bug is completely reproducible for me with Arduino IDE ver 1.8.13 on Windows 10.
The first character in the Serial Monitor Window is a backwards question mark. If I do a CTL-A, CTL-C, it will NOT
paste into another window. If I select everything but that backwards question mark, I CAN copy the text and paste it to another window.
Thank you,
Chris Shaker
Which Arduino board are you using?
You might be able to work around the issue by adding a short delay between the Serial.begin() and the first output to Serial Monitor. That has worked for me with certain boards.
It appears that clicking on the 'Clear output' box on the bottom right corner of the serial monitor window clears the problem...
Chris Shaker
I think the better sequence is CTRL-C and CTRL-V
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