Send_on_enter doesn't work

I have entered the following in my platform.ini:

But when I now open my Serial monitor I get the following error:

Executing task in folder ArduinOS: platformio device monitor <

— Available filters and text transformations: colorize, debug, default, direct, hexlify, log2file, nocontrol, printable, send_on_enter, time
— More details at Redirecting...
could not open port ‘send_on_enter’: [Errno 2] could not open port send_on_enter: [Errno 2] No such file or directory: ‘send_on_enter’
The terminal process “platformio ‘device’, ‘monitor’” terminated with exit code: 1.

Terminal will be reused by tasks, press any key to close it.

Documentation states send_on_enter is a possible option of monitor_filters, not monitor_flags.

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