mouse events are sent incorrectly in win32-input-mode

Steps to reproduce

1. Compile this test app using gcc under WSL:

#include <termios.h> 
#include <assert.h>
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <stdlib.h> 
#include <stdio.h> 
#include <unistd.h> 


int main()
{
    struct termios _ts = {};
	int _ts_r = tcgetattr(1, &_ts);
	if (_ts_r == 0) {
		struct termios ts_ne = _ts;
		//ts_ne.c_lflag &= ~(ECHO | ECHONL);
		cfmakeraw(&ts_ne);
		if (tcsetattr(1, TCSADRAIN, &ts_ne ) != 0) {
			perror("TTYBackend: tcsetattr");
		}
	}

	fprintf(stderr, "\x1b[?1049h");
	fprintf(stderr, "\x1b[?1000h");
	fprintf(stderr, "\x1b[?1001h");
	fprintf(stderr, "\x1b[?1002h");

	fprintf(stderr, "\x1b[?9001h");

	for (;;) {
		char ch = 0;
		if (read(0, &ch, 1) <= 0) break;
		if (ch <= 0x20 || ch == 0x7f) {
			if (ch == 0x1b) fprintf(stderr, " ");
			fprintf(stderr, "\\x%02x", (unsigned int)(unsigned char)ch);
		} else {
			fprintf(stderr, "%c", ch);
		}
		if (ch == 0x0d) break;
    	if (ch == 0x0a) break;
	}
	fprintf(stderr, "\x1b[?1049l");
	fprintf(stderr, "\x1b[?1000l");
	fprintf(stderr, "\x1b[?1001l");
	fprintf(stderr, "\x1b[?1002l");

	fprintf(stderr, "\x1b[?9001l");

	if (tcsetattr(1, TCSADRAIN, &_ts ) != 0) {
		perror("TTYBackend: tcsetattr");
	}
}

2. Run it under Windows Terminal

3. Move mouse over the terminal window.

Expected Behavior

We should see mouse movement escape sequences (\x1b[M... format)

Actual Behavior

We see win32-input-mode escape sequences (\x1b[A;B;C;D;E;F_ format)